Question

what is the purpose of a rearview mirror in a car?
the mirror allows the light to be absorbed so the driver will not see any glare.
the mirror allows the light to interfere so the light waves combine to form an image.
the mirror allows the light to be reflected so the objects behind the car can be seen.
the mirror allows the light to be transmitted so the light will not reach the drivers eyes.

Explanation:

A rearview mirror works based on the principle of light reflection. When light from objects behind the car hits the mirror, it bounces (reflects) off the mirror's surface. This reflected light then reaches the driver's eyes, enabling the driver to see the objects behind the car. Absorption (first option) would mean the light is taken in and not used for seeing. Interference (second option) is a phenomenon related to wave - wave interactions and not relevant here. Transmission (fourth option) would mean the light passes through the mirror, which is not the case for a rearview mirror.

Answer:

The mirror allows the light to be reflected so the objects behind the car can be seen.