A student obtained a sharp image of the grills of a window on a screen using a concave mirror. His teacher remarked that for getting better results a well lit distance object (preferably the sun) should be focussed on the screen. What should be done for this purpose?

Move the screen and the mirror away form the object

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Move the mirror slightly towards the screen

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Move the screen and the mirror towards the object

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Move the screen slightly away from the mirror

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Solution

The correct option is D
Move the screen slightly away from the mirror

When an object is between centre of curvature and infinity, image is formed between C and F. Sun can be considered at infinity. So, its image is formed at the focus of a concave mirror.

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A student obtained a sharp image of the grills of a window on a screen using a concave mirror. His teacher remarked that for getting better results a well lit distance object (preferably the sun) should be focussed on the screen. What should be done for this purpose?

The correct option is D Move the screen slightly away from the mirror When an object is between centre of curvature and infinity, image is formed between C and F. Sun can be considered at infinity. So, its image is formed at the focus of a concave mirror.

The correct option is D
Move the screen slightly away from the mirror

When an object is between centre of curvature and infinity, image is formed between C and F. Sun can be considered at infinity. So, its image is formed at the focus of a concave mirror.