Q.What is a periscope ? Ans =It is a cylindrical pipe in which two plane mirrors are placed one at the bottom and the the other one at the top and when the object at the top reflects light and then falls on the 1st mirror and that reflection then again falls and meet the 2nd mirror at the bottom of the cylindrical pipe then the reflection of light of that object and then to our eyes , then only we can see that object which was not visible directly but through this we can see that object of cylindrical pipe with 2 plane mirrors one at the top and the other one at the bottom it makes a scope that scope is known as a periscope .
But sir in periscope topic you have told that the light ray passes through the object so the object shot be luminous? If yes so if the object is non luminous so what we have to do ?
@@soniaagupta8824 I have a doubt ....... Please clear it .......While teaching the topic reflected ray can be reflected again,In the topic of Periscope you said that the ray that is coming from the object to the first mirror is the Incident ray ......but how is this possible in the case of non-luminous object ?? I wanna say that the ray that is coming from the light source to the object is the incident ray while the ray that falls on the mirror after getting reflected from the object should be the reflected ray .....but you said the same in the example of hair cutting that the ray falling from our face to mirror is Incident ray but it should be reflected ray as first the light fell on our face from the light source and that ray should be incident and the ray that fell on the mirror after getting reflected from our face should be reflected ray.......Please help I am confused 😰, I don't know if I am able to express my doubt and what i want to say clearly or not......
®Answers:- •Speed of light- 299792458m/s •Speed of sound-343m/s •Luminous object-torch •Non-luminous object-comb •Images are formed by regular reflection •Minimum number of mirrors used to form multiple images are-2
1) Artificial Luminous object- Sun, jugnu and star 2)Human made luminous object- Bulb, jugnu and tubelight. 3)Non luminous object examples- table, book, pen, etc.
17:21 luminous object, ,,sun ,candle ,bulb etc. Non luminous object, ,,pen ,,pencil ,moon,tree, etc 32:46 images are formed by "regular " reflection 😊 42:23 minimum number of mirror is 2
Q. What is the minimum number of mirror required for multiple image formation? Ans- Minimum two number of mirrors are required for multiple image formation
Physics wallah is not just a teaching platform but an emotion for students like us. I can proudly tell my teachers that I have learnt my concepts from physics wallah. Thanku Sir ❤
speed of sound is depended on that in which medium it is travelling 5000 in solid 1500 in liquid 340 in gas speed of light about 3 lakh km/s luminous object = stars non luminous object = human regular reflection as image fall on plane surface(mirrrors) 2 mirrors
The speed of light = 299,792,458 meters / second the speed of sound = 343 meters / second. example of luminous object is electric bulb and example of non luminous is chair Images are formed by a Reflected rays
Sir light ray reflected again by periscope also used for see object image so how 🤔 can we see object can object images also reflected please solve my dought
Luminous object _ sun, candle, firefly and bulb etc. Non luminous object _most of the things around us are non luminous such as table, chair, book, pencil etc. :) thanks❤
Thank You sir for this amazing session. I was really finding a good channel for class 8 and I found this channel. This Channel is beating Vedantu, Unacademy, Byju's, Toppr, and many more. Once Again Thank you so much, sir
Yeah, really, like byju's always gets the most attention but they only explain in english which is not as comprehensive as explaining in hindi with a bit english
All the answers All the virtual image is by regular reflection Speed of light -300000km per sec Speed of sound -343m per sec in air 2 mirrors are required for multiple reflection
Regular reflection: When parallel light rays hit a smooth surface and reflect, remaining parallel. easy definition of regular reflection. lease like my comment 😔😔😔😔😔😔😔😔😔😔😔😔😔😔😔😔😔😔
Kash jab mai 8th me tha, tab aise teacher milte mujhe
Kyun bhaiya ❤️ apne physic nhi padha tha .
@@abhivlog1076 are bro i am in 12th, mai to aise hi dekhne aa gya tha,btw I am a science student so i know this physics very well☺☺☺☺
Mujhe bhii yaar 😇😇
@@a.k.rtechnicals8858 mebi..😞
Koi ni aab pdh lo
Periscope:- 32:59
Multiple image :- 37:01
Kaleidoscope:- 42:45
😊
periscope nahi regular hoga
@@vijaymishra9486 Right 👍
@@vijaymishra9486 SHUT UP MORONES VO TIME STAMP DE RHA H KI YHA SE PERISCOPE KA TOPIC SHURU H ANSWER NHI BTA RHA
000000000
0
0
0
0
0
00000000000000000000000000
0000000000002
0000000
0
@@ayushprakash1081 wht
who are watching in 2025
Me❤😂
Me too😅
Me
Me
Me too bhai😅
1) Images are formed by regular reflection.
2) Two minimum number of mirrors are required for multimple image formation.
School me iss chapter ko padhane me 4 din lage aur yaha ek one shot me hee clear ho jata h😂😂😂😂😂👍👍
School me teacher hasa kara,bata kaeke,sabal puchuke padhatehe to 4 din lagata he.aur unha sir sib padathe he aur kuchu nahi karate he
sir ab nach ke padhaenge kya samajhne ke liye bahot h👍👍👍
@@killerboss6011 Achha toh school me pura din physics padte ho ki sirf ek Baar?
@@killerboss6011Hmmvo to ha😅
Class me shebh 40minute padhai jata hai
42:31 there are two parallel mirrors required for multiple image formation
Not multiple but infinite
Yeah you are right😊😊@@ChessCheater-is2we
26:45 Sir Please Use Dark Colors to write on bright background colors
Sir you're literally Saving life of students around the country 😂😂
Hi
Doctors be like: bruh 💀
Absolutely 😂
🤣🤣
Yes😂😂😂😂😂😂
Speed of light is 3×10 ^8❤ luminous like build and non luminous pen book door etc. Images are formed by regular reflection sir❤
Number minimum is 2
Hello
Students are never bored when they learn from physics wallah 😊😊😊😊
Obviously bro..
I am about to sleep
@@priyalmangal7236 ❤️❤️❤️❤️
YESSSSSSSSSSSSSSSSSSSSSS
@@priyalmangal7236 so pls sleep
17:25
Luminous : star
Non Luminous: wood, plastic
33:59 Regular surface
41:58 Two mirror
we need more teachers like them in our school too!!!
Light in One Shot | Physics - Class 8th | Umang | Physics Wallah
Ek bhi hai jo aur chaiye
I'm trying physics wallah first time 😊. And I was like oh wow that's awesome platform ❤ thank uhh physics wallah for this wonderful explanation ❤❤😊
😊😊😊😊😊
R you argreee
🎉🎉1❤🤬🤬🍌🍌🍌✋🍌💩
🧢😑
Improve ur grammar bro/sis
@@ae.Blinder chad bro
Yrr this teacher mind blowing ❤️♥️🥰
Yes yaar
Really yarr❤
O
23:12 hi sir Happy birthday 🎂🎈🎈🎈🎂🎈
🎉🎉🎉🎉🎉🎉🎉🎉😂😂😂😂😂
Sir 2 minimum number of mirrors required for multiple image formation
Infinity
Images are formed by Regular Reflection [ 32:56 ]
T ka kare
41:48 we need minimum two mirror to form multiple no. Of image
correct
17:19 torch is luminous and book is non-luminous
Thank you sir
10 times excellent 👌👌
Very nice video
3:48 A magical light who gives definitions. LoL 😅
😂😂😂😂😂
ikr :)hahahahaha
🤔 ha ha 😂
4:08
Thank you alok sir for easily clear this chapter
Um dj alok 🤘🤘🤣🤣😂
@@yadavsv680 what do you mean
Ye alakh sir nhi hai
Easly nhi easily hota hai 🤣😂😂🤣😂
😅😅😅🤣😂🤣🤣🤣🤣🤣😂😂😂😂
1:01:49 thank uuu..... Sir for helping us ...... ❤❤
8:08
Speed of light- 3×10⁸m/s
Speed of sound- 343m/s
how do you find please explain me
@@akhtabsnetflixaccount4515 its a fact
@@sanjaysingh-md3ki tnx
Kash ese best brilliant teacher mere school me hote teachers should be like u the technique of explanation is really awesome 👍😎
32:46 Images are formed by Regular Reflection
42:05 Atleast 2
@@amboygamer8505 hi
Hi
•Luminous-sun, bulb .
•Non luminous - book 📚, 🖋️ pens.
•Image is formed by REGULAR reflection.
•at least two mirror.
😊❤🎉
Great🎉
@@aman_singh713 thank you ☺️😊
Q.What is a periscope ?
Ans =It is a cylindrical pipe in which two plane mirrors are placed one at the bottom and the the other one at the top and when the object at the top reflects light and then falls on the 1st mirror and that reflection then again falls and meet the 2nd mirror at the bottom of the cylindrical pipe then the reflection of light of that object and then to our eyes , then only we can see that object which was not visible directly but through this we can see that object of cylindrical pipe with 2 plane mirrors one at the top and the other one at the bottom it makes a scope that scope is known as a periscope .
Right
😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂
😢😅
Itna bada😅
Nice answer thanks
8:34 speed of light=3*10⁸
8:35 ". ". sound=332m/s in air, 1450m/s in water and 5000m/s in solid.
Speed of light - 3 × 10^8 m/s
Speed of sound - 343 m/s
good
@@Fundaazgamer which school
@@FRAKandanime74798 black death scool
@@opticnewtella 🥱
@@opticnewtella 🌚
Legends watching 1 day before exam at 2x speed😂💀
Yeah broooooo
O balay oy
Samajh Aya ya nhi, mujhe to nahi aya
i appreciate your honour
Sameeeee😂
There are many examples of non luminous objects
Thank you sir 🙏😁
nn
Non luminous is moon
Luminous object is sun
33:06 Regular
Hi
1. Example of luminous object - star
and firefly
Example of non luminous object - pen and paper
Star is not luminous
@@BRoUJisOP ofc they are
The minimum number of mirrors required to form multiple images is '2'.
Yes
yep..m
Speed of light is 3×10^8m/s and sound is 343 m/s 😊😊
3:30 3:30 3:30 3:30 3:30 3:30 3:31 3:31 3:32 3:32 3:32 3:32 3:33 3:33 3:33 3:33 3:33 3:34 3:36 3:36 3:36 3:36 3:37 3:37 3:37 3:37 3:37 3:38
😊😊😊😊😊😊😊😊😊😊😊😊😊
You are really great teacher of physics sir 👏 👍
Apcosh
Tommorow is my exam and i am full preped for exam ...
Thanks sir ...
U r teaching to good 👍
On e again thanks sir ❤️
Speed of light=3×10⁸m/s
Speed of sound=343m/s
Luminous object - candles
Non luminous object - table
Maximum 2 mirrors are required for image formation
Luminous object sun or non luminous object moon ho sakta he
star bhi luminous object hai aur sir ne kaha tha ki jo examples mana khi hain bo nhi batani hai toh isliye table bhi sahi hai
@@bodhraj-r3v ok~♡ bhiya/didi
@@garima_sonii bilkul ho sakta hai
@@bodhraj-r3v Ab mene correct kar diya hai
17:27 Examples of luminous or non luminous are : -
LUMINOUS : Sun , Bulb etc .
NON LUMINOUS : pencil , Notebook etc .
Luminous=stars
42:28 The minimum number of mirrors required to multiple image formation is 2
17:26 luminous- sun
Non-luminous -moon,
Pencil
Sir bada acche se samaj aa raha he or notes itna easily mil taha he qya baat kare aab alok sir ki
Sabse bakwaas teacher h
But sir in periscope topic you have told that the light ray passes through the object so the object shot be luminous? If yes so if the object is non luminous so what we have to do ?
light can also be reflected. you can even see a pen in a plane mirror and it is non luminous.there is no compulsion for the object to be luminous
Thanks 👍
When the light of any luminous object will fall on non luminous object then the light will reflect and then we can see the non luminous object.
@@soniaagupta8824 I have a doubt ....... Please clear it .......While teaching the topic reflected ray can be reflected again,In the topic of Periscope you said that the ray that is coming from the object to the first mirror is the Incident ray ......but how is this possible in the case of non-luminous object ?? I wanna say that the ray that is coming from the light source to the object is the incident ray while the ray that falls on the mirror after getting reflected from the object should be the reflected ray .....but you said the same in the example of hair cutting that the ray falling from our face to mirror is Incident ray but it should be reflected ray as first the light fell on our face from the light source and that ray should be incident and the ray that fell on the mirror after getting reflected from our face should be reflected ray.......Please help I am confused 😰, I don't know if I am able to express my doubt and what i want to say clearly or not......
I commented this but i guess no one had seen this so can u please tell cause i think my doubt is similar to this one
®Answers:-
•Speed of light- 299792458m/s
•Speed of sound-343m/s
•Luminous object-torch
•Non-luminous object-comb
•Images are formed by regular reflection
•Minimum number of mirrors used to form multiple images are-2
Noobra
Aisa sir maine pahle bar dekh raha hu itna accha padha rahe hai sab kuch samajh me aa raha hai ❤❤
1) Artificial Luminous object- Sun, jugnu and star
2)Human made luminous object- Bulb, jugnu and tubelight.
3)Non luminous object examples- table, book, pen, etc.
Jugnu hits different....😂
It is not artificial it's natural
Your smile is amazing I found this channel first time but now my class 8 is close to end and 9 to start😭😄😄🧑⚕️🧑⚕️🧑⚕️
Only annuals left
😅😅😅😅😅😅
😅😅
Same to me 😢
LUMINOUS ☀️☀️⭐⭐🌩🌩🔥🔥
17:21 luminous object, ,,sun ,candle ,bulb etc.
Non luminous object, ,,pen ,,pencil ,moon,tree, etc
32:46 images are formed by "regular " reflection 😊
42:23 minimum number of mirror is 2
Q) EXAMPLES OF LUMINOUS AND NON LUMINOUS
ANS) Torch🔦, bulb💡 etc........
Pen✒, book📕 etc........
🤗😊🥰
Sir, very good explanation. Now I'm totally prepared for my physics exam.
Q. What is the minimum number of mirror required for multiple image formation?
Ans- Minimum two number of mirrors are required for multiple image formation
Hii
Hii
17:29 Luminous: just like 💡 bulb
No- luminous: like 🌝 moon
Moon🌚
30:38 sir ek reflected Ray chut gya hai
Physics wallah is not just a teaching platform but an emotion for students like us. I can proudly tell my teachers that I have learnt my concepts from physics wallah. Thanku Sir ❤
Isne Sunil tripathi ki cheating ki hai
speed of sound is depended on that in which medium it is travelling 5000 in solid 1500 in liquid 340 in gas
speed of light about 3 lakh km/s
luminous object = stars
non luminous object = human
regular reflection as image fall on plane surface(mirrrors)
2 mirrors
🙅🙅🙅🙅🙅🙅🙅 but corrrect
17:32 luminous object is bulb 💡
Non luminous object is star
Sound have different speed in different medium
Speed in air =330m/s
Speed in water=1500m/s
Speed in Steel=6000m/s
32:25 IMAGES ARE FORMED BY REGULAR REFLECTION
41:54 MINIMUM 2 MIRORS ARE REQUIRED TO FORM A MULTIPLE IMAGES
Thank you sir, I understand very well what you read.
3:03 Light is a form of energy with makes our surrounding visible to us
Thank you so much sir ❤️ for giving your great time on we noob students ❤
School me kash ase teachers hote ❤
no wa i dont want this teacher
i only want ritik sir.
Ritik sir is the best than this sir
ok
17:28 some examples are:-
luminous - Bulb, stars, fireflies
non luminous - humans, books, packet of chips and many more...
The speed of light = 299,792,458 meters / second
the speed of sound = 343 meters / second.
example of luminous object is electric bulb and example of non luminous is chair
Images are formed by a Reflected rays
❤
😊
The minimum number of mirrors is two for forming multiple images🖼
15:40 Sir Use Dark colors to write on white or yellow color background
Images are formed by regular reflection 👍👍
😁i really really appericiate your effort, sir. youre the best teacher🤩❤
sir You the best teacher from whom I've learnt till now in my whole life😄😄❤❤
20:25 jo 2025 me dekh rha h vo like and comment kro .
Luminous= sun , fire etc. Non-luminous= pen, pencil,book etc. ❤
Speed of light = 3×10⁸ m/s
Speed of sound 343 m/s
Sir light ray reflected again by periscope also used for see object image so how 🤔 can we see object can object images also reflected please solve my dought
Hello Sir🙏
Example Of Luminous Object ~ Star
Example of Non - luminous object ~ Wood .
Thanks sir to explain this chapter we can understand easily thanks for pw launched this batch in free of cost
41:30 Sir spelling of mirror is incorrect
Answer:To obtain multiple images, two or more mirrors are required. 41:44
Awesome way of teaching. Thank you so much sir 🙏💞
Hiii
Bolo
Luminous objects ==stars💫
Non-luminous object =book📒
Speed of light in vacuum- 3×10^8 m/s .
Speed of sound - 343m/s
Luminous object _ sun, candle, firefly and bulb etc.
Non luminous object _most of the things around us are non luminous such as table, chair, book, pencil etc. :) thanks❤
Thank You sir for this amazing session. I was really finding a good channel for class 8 and I found this channel. This Channel is beating Vedantu, Unacademy, Byju's, Toppr, and many more. Once Again Thank you so much, sir
Really?
@@gargitripathi3230 yeah
Yeah, really, like byju's always gets the most attention but they only explain in english which is not as comprehensive as explaining in hindi with a bit english
I THINK YOU NEVER SEEN MAGNET BRAIN
Guys all are best don't do this all are helping us only
Example:- Luminous - Stars ; Non-luminous-Wooden Box
17:23
Speed of light=3×10^8m/s
Speed of sound = 343m/s
Luminous object - 🔥 fly
Non-luminous object - ✏️ , 📖
All the answers
All the virtual image is by regular reflection
Speed of light -300000km per sec
Speed of sound -343m per sec in air
2 mirrors are required for multiple reflection
good
@@mayurhegde thanks
its 300000km per second
stolen answer + wrong
@@white_shadow7233 mine is not stolen and right it is there in my book
8:34 speed of light - 3*10^8
8:35 speed of sound -340m/s
Speed of sound 343 m/s or 0.343 km/s
41:33 41:33 41:33 41:33 41:33 41:33 41:33😂😂😂😂😂😂😂😂😂😂😂😂
Speed of light = 3×10^8 m/s
Speed of sound = 343 m/s
Ex. of Luminous = 1. Bulb
Ex. of Non-luminous = 1. Book
Regular Reflection
2 mirrors
41:43
Question. What is the minimum number of mirrors required for multiple image formation?
And. 2(two)😸😸
Yes brother your answer is right
Example of luminous= Stars,sun, fire
Example of non-luminous= table, pen,box etc
Sun is also a star
yes
@@TriptiRashmi
What is the relation between angle I and angle R sir please bata de
Example :- (i) Luminous - stars , Torch , Tube light , etc .
(ii) Non - Luminous - Planets , stones , cloth , etc .
Regular reflection: When parallel light rays hit a smooth surface and reflect, remaining parallel. easy definition of regular reflection. lease like my comment 😔😔😔😔😔😔😔😔😔😔😔😔😔😔😔😔😔😔
Thanks bro❤❤
17:29 luminous- sun and star
Non-luminous - pencil and book
Speed of light - 299792458 m/s
Speed of sound - 343 m/s
Luminous object - Sun, Bulb, Etc.
Non luminous object - Moon, Trees, Etc
1. Luminous - Light/Electric bulb
Non Luminous - Scale, Book etc
2. Regular reflection
3. 2 Mirrors
1) speed of light - 3×10(8)m/s
2) luminous - Star, Non luminous- chair
3) Regular mirror ( Plane mirror)
4) 4 mirrors
Thankyou ☺️
1st ms-¹ Ya K/h dalu..
@@studywithmilubilu460 Si unit..🙂
Yeah
And speed of sound= 330m/s
Spelling of plane is wrong