124 A convex a concave lens are brought in close contact

Last updated: 6/27/2023

124 A convex a concave lens are brought in close contact along their optical axes The focal length of the convex lens is 10 cm When the system is placed at 40 cm from an object a sharp image of the object is formed on a screen on the other side of the system Determine the optical power of the concave lens if the distance between the object the screen is 1 6 m A 6 7 D C ZOD B 6 7 D D 70D