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Physics Part-II

Ray Optics and Optical Instruments

(a) Figure shows a cross-section of a light pipe made of a gla

Physics Part-II

Class 12

NCERT

Chapter 1: Ray Optics and Optical Instruments

41 questions

A small pin fixed on a table top is viewed from above from a distance of 50 cm. By what distance would the pin appear to be raised if it is viewed from the same point through a 15 cm thick glass slab held parallel to the table? Refractive index of glass

=

1.5. Does the answer depend on the location of the slab?

(a) Figure shows a cross-section of a light pipe made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure.

(b) What is the answer if there is no outer covering of the pipe?

Answer the following questions:

(a) You have learnt that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain.

(b) A virtual image, we always say, cannot be caught on a screen. Yet when we see a virtual image, we are obviously bringing it on to the screen (i.e., the retina) of our eye. Is there a contradiction?

(c) A diver under water, looks obliquely at a fisherman standing on the bank of a lake. Would the fisherman look taller or shorter to the diver than what he actually is?

(d) Does the apparent depth of a tank of water change if viewed obliquely? If so, does the apparent depth increase or decrease?

(e) The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to a diamond cutter?

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Chapter 2: Wave Optics

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Chapter 4: Atoms

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Chapter 5: Nuclei

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Question

Hard

Solving time: 5 mins

(a) Figure shows a cross-section of a light pipe made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure.
(b) What is the answer if there is no outer covering of the pipe?

$Refraction of light$

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Updated on: Oct 18, 2023

Book:

Physics Part-II (NCERT)

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(b) What is the answer if there is no outer covering of the pipe?

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Text solutionVerified

(a)

μ_{1} = 1.68, μ_{2} = 1.44

μ_{1} / μ_{2} = 1/ s in i_{1} \Rightarrow i_{1} = 5 9^{o}

For critical angle, total internal reflection takes place when

i > i_{1}

maximum angle of reflection is

90 - i_{1} = 3 1^{o} = r_{ma x}

Let

i_{ma x}

be the maximum angle of incidence.

μ_{1} = s in i_{ma x} / s in r_{ma x} \Rightarrow i_{ma x} = 6 0^{o}

Thus all the ray between

0^{o} < i < 6 0^{o}

will suffer TIR.

(b)

Now,

μ_{1} = 1

(air)

s ini / s in r = μ_{2} / μ_{1} \Rightarrow r = 36. 5^{o}

i = 90 - 36.5 = 53. 5^{o}

Since

i > r

, all incident ray will suffer TIR

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Practice more questions from Physics Part-II (NCERT)

=

1.5. Does the answer depend on the location of the slab?

(b) What is the answer if there is no outer covering of the pipe?

Answer the following questions:

(a) You have learnt that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain.

(c) A diver under water, looks obliquely at a fisherman standing on the bank of a lake. Would the fisherman look taller or shorter to the diver than what he actually is?

(d) Does the apparent depth of a tank of water change if viewed obliquely? If so, does the apparent depth increase or decrease?

(e) The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to a diamond cutter?

View all

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Question Text	(a) Figure shows a cross-section of a light pipe made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure. (b) What is the answer if there is no outer covering of the pipe?
Updated On	Oct 18, 2023
Topic	Ray Optics and Optical Instruments
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 5
Upvotes	643
Avg. Video Duration	16 min

Text solutionVerified

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