First slide

Refraction of light

Question

A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5, the wavelength of refracted light will be

Easy

A

dependent on intensity of refracted light
B

same
C

smaller
D

larger

Solution

From $μ = \frac{c}{v} = \frac{n λ_{v}}{n λ_{m}}, λ_{m} = \frac{λ_{v}}{μ}$
Here, c = velocity of light in medium and
V = velocity of light in vacuum; m = refractive index of the medium.
Hence, wavelength in medium $(λ_{m}) < λ_{a} (∵ μ > 1, g i v e n)$
So, the required wavelength decreases.
Alternatively,
$v = f λ$ , On refraction, the frequency, f do not change. When light is refracted from vacuum to a medium, the velocity, v decreases. Therefore, $λ$ also decreases.

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App