Question

A convex lens of focal length 10 cm is in contact with a concave lens. The focal length of the combination is numerically equal to that of the concave lens. The focal length of the concave lens is

Answer 1

Answer:

Convex lens of 10 cm focal length is combined with a concave lens of 6 cm focal length.

Answer 2

Explanation:

the difference between a convex lens and a concave lens give one use of convex lens and one of concave lensa 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