Question

A rays of light AB enters into a glass slab at an angle of 45°. It emerges out from the opposite face of glass to form emergent ray CD. The ratio between the angle of incidence and angle of emergence is:

Options

• 2 : 1

• 1 : 2

• 1 : 1

• none of these

Answer 1

1 : 1

Explanation:

In a glass slab with parallel opposite faces, the emergent ray is parallel to the incident ray. Therefore, the angle of emergence equals the angle of incidence, giving a ratio of 1 : 1.