Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12

# When Light is Refracted into a Medium, - Physics

MCQ
Fill in the Blanks

When light is refracted into a medium, ______________ .

#### Options

• its wavelength and frequency increase

• its wavelength increases but frequency remains unchanged

• its wavelength decreases but frequency remains unchanged

• its wavelength and frequency decrease

#### Solution

its wavelength decreases but frequency remains unchanged

Frequency of a light wave, as it travels from one medium to another, always remains unchanged, while wavelength decreases.

Decrease in the wavelength of light entering a medium of refractive index $\mu$ is given by

$\lambda_M = \frac{\lambda}{\mu},$

$\text{where }\lambda_M = \text{wavelength in medium}$

$\lambda = \text{wavelength in vacuum}$

$\mu = \text{refractive index}$

Concept: Refraction and Reflection of Plane Waves Using Huygens Principle - Refraction at a Rarer Medium
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#### APPEARS IN

HC Verma Class 11, 12 Concepts of Physics 1
Chapter 17 Light Waves
MCQ | Q 5 | Page 379