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Image Formation by Spherical Mirrors

A student get...

Question

A student gets a blurred image of a distant object on a screen which is fixed at a place. In order to obtain a sharp image on the screen, he will have to shift the mirror:
(1) towards the screen
(2) away from the screen
(3) either towards or away from the screen
(4) very far away from the screen

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Solution

A concave mirror converges all the rays coming from infinity or from a distant object on its focus and forms a clear image on the screen if placed right at the focus. If the student is getting a blurred image that means he needs to shift the mirror either away or towards the screen so that the focal point can b obtained on the screen and the rays can converge on the screen to form a clear image.

Hence, the correct answer is option 3.

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