Optics 2 Question 16
16. When a ray of light enters a glass slab from air
$(1980,1 M)$
(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:
- $\lambda=\frac{v}{f}$
In moving from air to glass, $f$ remains unchanged while $v$ decreases. Hence, $\lambda$ should decrease.
