Optics 2 Question 16

16. When a ray of light enters a glass slab from air

(1980,1M)

(a) its wavelength decreases

(b) its wavelength increases

(c) its frequency increases

(d) neither its wavelength nor its frequency changes

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Answer:

Correct Answer: 16. (a)

Solution:

  1. λ=vf

In moving from air to glass, f remains unchanged while v decreases. Hence, λ should decrease.



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