A lens forms a blurred image of a point object on a screen as shown in figure. Which of the following can lead to a sharp image on the screen ?

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By using a lens of smaller focal length

By moving the screen towards lens

By moving the object towards the lens

By using a lens of larger focal length

answer is A, B, C.

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Detailed Solution

Use $\frac{1}{v} - \frac{1}{(- u)} = \frac{1}{f} \Rightarrow v = \frac{f}{1 - \frac{f}{u}}$ , If u decreases , v increases. Also if f increases, v increases.

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