A motor cyclist observes a car coming from behind with a magnification `1/6`. If the actual distańce between the car and the bike is 30 m calculate the radius of curvature ofțhe mirror.

A motor cyclist observes a car coming from behind with a magnification 1/6. If the actual distance between the car and the bike is 30 m calculate the radius of curvature of the mirror.

Refraction of light is the phenomenon of change in the path of light ray when it goes from one medium to another.The radius of curvature of each face of a convex lens made of glass of refractive index 1.5 is 30 cm. Calculate the focal length of the lens in air.