Get 2 FREE Instant-Explanations on Filo with code FILOAPP

Home

Class 12

Physics

Ray Optics and Optical Instruments

Refraction

A ball is dropped from a height of 20 {~m} above the surface o

Question

Hard

Solving time: 4 mins

A ball is dropped from a height of $20 m$ above the surface of water in a lake. The refractive index of water is $\frac{4}{3}$ . A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is $12.8 m$ above the water surface, the fish sees the speed of ball as

9 ms^{- 1}

12 ms^{- 1}

16 ms^{- 1}

21.33 ms^{- 1}

Views: 5,901 students

Updated on: Nov 13, 2023

Found 3 tutors discussing this question

Harper Discussed

A ball is dropped from a height of

20 m

above the surface of water in a lake. The refractive index of water is

\frac{4}{3}

. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is

12.8 m

above the water surface, the fish sees the speed of ball as

12 mins ago

Discuss this question LIVE

12 mins ago

Text solutionVerified

v = 2 g h = 2 \times 10 \times 7 = 12 ms^{- 1}

In this case when eye is inside water,
Solution Image

x_{app.} = μx

∴ \frac{d x _{app.}}{d t} = μ \frac{d x}{d t}

v_{app.} = μv = \frac{4}{3} \times 12 = 16 ms^{- 1}

Was this solution helpful?

Report

Filo tutor solutions (6)

Learn from their 1-to-1 discussion with Filo tutors.

2 mins

Uploaded on: 2/27/2023

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Dr Gaurav Verma

Total classes on Filo by this tutor - 9,786

Teaches : Physics, Biology, Organic Chemistry

Connect instantly with this tutor

Connect now

Notes from this class (1 pages)

Download

Was this solution helpful?

Report

3 mins

Uploaded on: 11/13/2023

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Shashwat Dubey

Total classes on Filo by this tutor - 2,502

Teaches : Physics, Mathematics, Inorganic Chemistry

Connect instantly with this tutor

Connect now

Notes from this class (3 pages)

Download

Was this solution helpful?

Report

15 mins

Uploaded on: 11/15/2022

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Aditya Yadav

Total classes on Filo by this tutor - 2,762

Teaches : Physics, Mathematics, English

Connect instantly with this tutor

Connect now

Notes from this class (3 pages)

Download

Was this solution helpful?

143

Report

See more 1-on-1 discussions (3)

One destination for complete JEE/NEET preparation

One destination to cover all your homework and assignment needs

Learn Practice Revision Succeed

Instant 1:1 help, 24x7

60, 000+ Expert tutors

Textbook solutions

Big idea maths, McGraw-Hill Education etc

Essay review

Get expert feedback on your essay

Schedule classes

High dosage tutoring from Dedicated 3 experts

Trusted by 4 million+ students

Stuck on the question or explanation?

Connect with our Physics tutors online and get step by step solution of this question.

231 students are taking LIVE classes

Question Text	A ball is dropped from a height of $20 m$ above the surface of water in a lake. The refractive index of water is $\frac{4}{3}$ . A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is $12.8 m$ above the water surface, the fish sees the speed of ball as
Updated On	Nov 13, 2023
Topic	Ray Optics and Optical Instruments
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 6
Upvotes	687
Avg. Video Duration	7 min

Text solutionVerified

Filo tutor solutions (6)

Practice more questions from Ray Optics and Optical Instruments

Practice questions on similar concepts asked by Filo students

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 34​. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball as

Text solutionVerified

Filo tutor solutions (6)

Practice more questions from Ray Optics and Optical Instruments

Practice questions on similar concepts asked by Filo students

Related books for questions on Ray Optics and Optical Instruments