Question

The phenomenon in optics, that is similar to the phenomenon of ionospheric reflection of radio waves, (by the ionosphere) is the phenomenon of 

(1) Refraction of light rays 

(2) Diffused, irregular reflection, of light rays 

(3) Regular, intense, reflection, of light rays 

(4) Total internal reflection,of light rays

Answer 1

Correct option: (4) Total internal reflection,of light rays

Explanation: 

Ionospheric reflection, of radio waves, may be regarded as similar to the phenomenon of ‘total internal reflection’ in optics.