Question

Consider the following assertion and reason and choose the correct option.
Assertion: When a diver under water, looks obliquely at a fisherman standing on the bank of a lake, then fisher man looks taller.
Reason: When a ray of light travelling in air enters water, it bends toward normal.

• A. Assertion and reason both are correct and reason is a correct explanation of assertion.
• B. Assertion and reason both are correct but reason is not a correct explanation of assertion.
• C. Assertion is correct and reason is incorrect.
• D. Assertion is incorrect and reason is correct

Answer 1

The correct option is A Assertion and reason both are correct and reason is a correct explanation of assertion.

When the light ray travels from fisherman to the eye of diver, it suffers refraction at air-water interface.


When light ray enter from air to water, it will bend towards normal $\left(N\right)$. Thus for diver it will appear to come from further away $\left(A^{\prime }\right)$.
Hence, $O{A}^{\prime }>OA$ or fisherman appears taller to diver.
Hence, $\left(a\right)$ is the correct option.

Why this question? Always pay attention that when light ray bends towards normal, the refracted ray appears as if coming from a larger distance. Application: Extend the refracted ray in backward direction to obtain virtual image.