Question

The angle of incidence at which the angle of refraction is 0º is called the critical angle.

Answer 1

it is false because when the angle of refraction is equal to 90' the angle of incidence is called critical angle

Answer 2

Dear Student,

● Given statement -

The angle of incidence at which the angle of refraction is 0º is called the critical angle.

◆ Answer -

False

● Corrected statement -

The angle of incidence at which the angle of refraction is 90º is called the critical angle.

◆ Extra information -

• It's that angle of incidence which provides angle of refraction 90°.
• At critical angle, the incident ray grazes after refraction.
• After angle of incidence goes over critical angle, incident ray completely undergoes total internal reflection.
• Critical angle can be calculated as -

sinθ = 1/μ

Thanks dear. Hope this helps you...