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A beam of monochromatic blue light of wa...

A beam of monochromatic blue light of wavelength 4200 Å in air , travels in water of refractive index `(4)/(3)` . What is the its wavelength in water ?

A

4200 Å

B

5600 Å

C

3150 Å

D

3850 Å

Text Solution

Verified by Experts

The correct Answer is:
C
`n = (lambda_(a))/(lambda_(w))`
`therefore lambda_(w) = (lambda_(a))/(n) = (4200)/(4//3) = 4200 xx (3)/(4) = 3150` Å
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