Question

A candle is kept at a distance of 15cm from a convex lens and it's image is obtained on a screen placed at a distance of 30 cm from the lens now if the lens is shifted 'x' distance towards the screen without displacing the candle or the screen again a sharp image is formed the value of 'x' is

Answer 1

Answer:

May be this answer can be:

f=20 or m= -1/2

Answer 2

Answer:

Explanation:

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