Class 12 Physics
CBSE and UP Board
Wave Optics
Chapter-10 Exercise 10.14
NCERT Solutions for Class 12 Physics Chapter 10 Question-14
Additional Exercise
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) Wave length. (v) Intensity of the wave. On which of these factors, if any, does (a) The speed of light in vacuum, (b) The speed of light in a medium (say, glass or water), depend?
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Ans (a).
The speed of light in a vacuum i.e., 3 x 108 m/s (approximately) is a universal constant. It is not affected by the motion of the source, the observer, or both. Hence, the given factor does not affect the speed of light in a vacuum.
Ans (b).
Out of the listed factors, the speed of light in a medium depends on the wavelength of light in that medium.