A thin converging lens of focal length f = 25 cm forms the image of an object on a screen placed at a distance of 75 cm from the lens. Now the screen is moved closer to the lens by a distance of 25 cm. The distance through which the object has to be shifted so that its image on the screen is sharp again is
Text Solution
Verified by ExpertsThe correct answer is:
C
12. 5 cm
According to the first condition
f = 25 cm, V = 75 cm
According to the second condition
vi = 50 cm, f = 25 cm !-_L._ J,
So, the image is sharp again for,
= 50-37 .5
= 12 .5 cm
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