Amirror works on the principle of a. refraction b. reflection, c.dispersion? and a lens works on the principle of a. refraction b. reflection c. dispersion?

Mirrors are about reflection (they reflect your image)
and the lens are about refraction (slightly changing the direction)

Explanation :

A mirror works on the principle of reflection. This law states that :

Angle of the incidence is equal to the angle of reflection.The incident ray, the reflected ray, the normal and the point of incidence all lie in the same plane.

Hence, the correct option is (B).

A lens works on the principle of refraction of light. This law states that :

where sin i is the sine of angle of incidence and sin r is the sine of angle of refraction.The incident, reflected, normal all lie in the same plane.

Hence, the correct option is (A).

As newton's first law states a object in motion stays in motion