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Physics Part-II
Class 12
NCERT
1
Chapter 1: Ray Optics and Optical Instruments
41 questions
2
Chapter 2: Wave Optics
30 questions
Q1
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?
Q2
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.
Q3
Let us list some of the factors, which could possibly influence the speed of wave propagation:
(i) nature of the source.
(ii) direction of propagation.
(iii) motion of the source and/or observer.
(iv) wavelength.
(v) intensity of the wave.
On which of these factors, if any, does
(a) The speed of light in vacuum
View all question(i) nature of the source.
(ii) direction of propagation.
(iii) motion of the source and/or observer.
(iv) wavelength.
(v) intensity of the wave.
On which of these factors, if any, does
(b) The speed of light in a medium (say, glass or water), depend?
3
Chapter 3: Dual Nature of Radiation and Matter
44 questions
4
Chapter 4: Atoms
23 questions
5
Chapter 5: Nuclei
38 questions
6
Chapter 6: Semiconductor Electronics: Materials, Devices and Simple Circuits
25 questions
Question
Medium
Solving time: 3 mins
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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Text solution
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Let an object at O be placed in front of a plane mirror MO’ at a distance , (as shown in the given figure 1).
A circle is drawn from the centre (O) such that it just touches the plane mirror at point O’.
According to Huygens’ Principle, XY is the wavefront of incident light.
If the mirror is absent, then a similar wavefront X’Y’ (as XY) would form behind O’ at distance (as shown in the given figure 2).
X'Y' can be considered as a virtual reflected ray for the plane mirror. Hence, a point object placed in front of the plane mirror produces a virtual image whose distance from the mirror is equal to the object distance (r).
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Practice more questions from Physics Part-II (NCERT)
Q1
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?
Q2
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.
Q3
Let us list some of the factors, which could possibly influence the speed of wave propagation:
(i) nature of the source.
(ii) direction of propagation.
(iii) motion of the source and/or observer.
(iv) wavelength.
(v) intensity of the wave.
On which of these factors, if any, does
(a) The speed of light in vacuum
View all(i) nature of the source.
(ii) direction of propagation.
(iii) motion of the source and/or observer.
(iv) wavelength.
(v) intensity of the wave.
On which of these factors, if any, does
(b) The speed of light in a medium (say, glass or water), depend?
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| Question Text | 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. |
| Updated On | Aug 7, 2022 |
| Topic | Wave Optics |
| Subject | Physics |
| Class | Class 12 |
| Answer Type | Text solution:1 Video solution: 8 |
| Upvotes | 879 |
| Avg. Video Duration | 13 min |
