Question

A ray of light of wavelength λ incident at an angle 45° on the surface of a slab of ice of thickness 1 m is refracted into it at an angle of 30°. Speed of light in vacuum is c m/s. Then which of the following statement(s) is/are correct?

• A. Refractive index of ice is √2.
• B. Wavelength of light in ice is λ√2.
• C. Speed of light in ice is $\frac{c}{√2}$ m/s.
• D. Time taken by the light ray to cross the ice-slab is $\frac{\sqrt{8/3}}{c}$ sec.

Answer 1

Answer: (A), (C), (D)

Refractive index of ice is √2.

Answer 2

The correct option is: A ,C and D