Question

Assertion (A): Air is an optically rarer medium whereas glass is an optically denser medium. When a ray of light goes from air into a rectangular glass slab perpendicularly, it bends towards the normal (at the point of incidence).

Reason (R): A stick held obliquely and partly immersed in water appears to be bent at the water surface due to the phenomenon of refraction of light.

Options

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is false but R is true.

Explanation:

The assertion is false because a light ray entering a glass slab perpendicularly (at an angle of 0°) passes straight through without bending at all. The reason is true because a stick immersed obliquely in water appears bent at the surface due to refraction.