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Explain how Corpuscular theory predicts the speed of light in
Physics Part-II
Physics Part-II

Class 12

NCERT

Publisher:
NCERT
Subject:
Physics
1

Chapter 1: Ray Optics and Optical Instruments

41 questions

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2

Chapter 2: Wave Optics

30 questions

Q1
The 6563 line emitted by hydrogen in a star is found to be red-shifted by 15 . Estimate the speed with which the star is receding from the Earth.
Q2
Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental deteration of the speed of light in water? If not, which alternative picture of light is consistent with experiment?
Q3
You have learnt in the text how Huygens principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.
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3

Chapter 3: Dual Nature of Radiation and Matter

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4

Chapter 4: Atoms

23 questions

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5

Chapter 5: Nuclei

38 questions

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6

Chapter 6: Semiconductor Electronics: Materials, Devices and Simple Circuits

25 questions

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Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental deteration of the speed of light in water? If not, which alternative picture of light is consistent with experiment?

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Physics Part-II (NCERT)

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Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental deteration of the speed of light in water? If not, which alternative picture of light is consistent with experiment?
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No; Wave theory
Newton’s corpuscular theory of light states that when light corpus
of two media moves from a rarer (air) to a denser (water) medium, the particles experience forces of attraction normal to the surface. Hence, the normal component of velocity increases while the component along the surface remains unchanged.
Hence,
 = Angle of incidence
 = Angle of reflection
 = Velocity of light in air
 = Velocity of light in water
We have the relation for relative refractive index of water with respect to air as
Thus,
Hence, it can be inferred that . This is not possible since this prediction is opposite to the experimental results of .
The wave picture of light is consistent with the experimental results.
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The 6563 line emitted by hydrogen in a star is found to be red-shifted by 15 . Estimate the speed with which the star is receding from the Earth.
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Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental deteration of the speed of light in water? If not, which alternative picture of light is consistent with experiment?
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Question Text
Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental deteration of the speed of light in water? If not, which alternative picture of light is consistent with experiment?
TopicWave Optics
SubjectPhysics
ClassClass 12
Answer TypeText solution:1
Upvotes46