Question

When a ray of light enters into another optical medium, its wavelength and velocity change. The material in which wavelength and velocity decrease maximum, when the ray is travelling through air is:

विकल्प

• alcohol

• diamond

• glass

• water

Answer 1

Diamond

Explanation:

Diamond has the highest refractive index among these materials. Light travels slowest in it, so its speed and wavelength decrease the most when it enters from air.