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).

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.