Question

Assertion (A): In case of rainbow, light at the inner surface of the water drop gets internally reflected. Reason (R): The angle between the refracted ray and normal to the drop surface is greater than the critical angle.
(A) Both A and R are true and R is the correct explanation of A.
(B) Both A and R are true but R is NOT the correct explanation of A.
(C) A is true but R is false.
(D) A is false and R is true​

Answer 1

Answer:

Assertion : In case of a rainbow, light at the inner surface of the water drop gets internally reflected.

Reason : The angle between the refracted ray

and normal to the drop surface is greater than the critical angle.（ ）

A.

both Assertion and Reason are true and Reason is the correct explanation of the Assertion.

B.

both Assertion and Reason are true but Reason is not a correct explanation of the Assertion

C.

Assertion is true but the Reason is false

D.

both Assertion and Reason are false

Answer 2

(C) A is true but R is false.

• In the case of the rainbow, the light at the inner surface of the water drop gets internally reflected. Some of the light that enters the droplet will be internally reflected from the inside edge of the drop and will escape the drop, undergoing refraction as it goes back from the denser medium to the rarer medium.
• Though, this internal reflection happens only when the angle of incidence is greater than the critical angle. Hence, the given assertion is true.
• The given reason that the angle between the refracted ray and normal to the drop surface is greater than the critical angle is incorrect because it is not related to the angle of refraction as explained above.
• Hence, the assertion is true and the reason is false.