Question

Nature of a concave lens,convex lens​

Answer 1

Answer:Concave lens

A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens meaning that it spread out light rays that have been refracted through it. Convex lens

A convex lens is called a converging lens because of its ability to converge a parallel beam of light on a point called principal focus

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Answer 2

Explanation:

a fly wheel is rotating at 50 rpm. A motor

gives it a constant angular acceleration of 0.5

rad/s2 until it reaches 100 rpm. the motor is then

disconnected. How many revolutions are

completed at t= 20 s?

(A) 25 rev

(B) 29 rev

(C) 20 rev

(D) 15 rev