When a light ray enters a glass slab its wavelengthA) Decreases B) Inc

1.	When a light ray enters a glass slab its wavelengthA) Decreases B) IncreasesC) Remains unchangedD) Data are not complete
Answer» Correct Answer is: A) Decreases As the light enters from rarer medium to the denser medium, the speed of light decreases but the frequency remains the same. The relation between Speed of light, wavelength and frequency is given as: V = nλ Where V is speed N = frequency of light λ = wave length n = v/λ In denser medium, speed decreases, therefore wavelength also decreases. To keep frequency constant.

When a light ray enters a glass slab its wavelengthA) Decreases B) IncreasesC) Remains unchangedD) Data are not complete

Answer»

Correct Answer is: A) Decreases

As the light enters from rarer medium to the denser medium, the speed of light decreases but the frequency remains the same.

The relation between Speed of light, wavelength and frequency is given as:

V = nλ

Where V is speed

N = frequency of light

λ = wave length

n = v/λ

In denser medium, speed decreases, therefore wavelength also decreases. To keep frequency constant.