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Physics
When a ray of light enters a glass slab from air
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Q. When a ray of light enters a glass slab from air
IIT JEE
IIT JEE 1980
A
its wavelength decreases
58%
B
its wavelength increases
19%
C
its frequency increases
9%
D
neither its wavelength nor its frequency changes
14%
Solution:
$\lambda=\frac{v}{f}$
In moving from air to glass, / remains unchanged while v
decreases. Hence, $\lambda$ should decrease.