As in laboratory, you place the light source (object) at one end of the optical

Question

As in laboratory, you place the light source (object) at one end of the optical bench and the screen (image) near the other end of the optical bench, 100 cm from the light source. With this arrangement, you discover that when a particular lens is placed 40 cm from the light source that a sharp image forms on the screen. Where else can you place the lens to form a sharp image on the screen? a) 60 cm from the light source. b) 50 cm from the light source. c) There is no other place where the lens will form a sharp image on the screen. d) 80 cm from the light source. e) 20 cm from the light source.

Explanation / Answer

let u and v be the obejct and image distance respectively

given u + v = 100 cm

u = 40 cm

so v = 60 cm

i,e if object is placed at 40 cm , image is formed at 60 cm and vice versa

so the other object location is u = 60 cm

option A it is

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