A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focusing a well illuminated distant object. What should the student do?

He should move the mirror away from the screen

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He should move the mirror slightly towards the screen

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He should move the mirror as well as the screen towards the newly selected object

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He should move only the screen towards the newly selected object

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Solution

The correct option is B
He should move the mirror slightly towards the screen

As the image distance is increased, the object distance would decrease and thus the mirror-screen distance should be decreased. Therefore, the mirror should be moved towards the screen

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The correct option is B He should move the mirror slightly towards the screenAs the image distance is increased, the object distance would decrease and thus the mirror-screen distance should be decreased. Therefore, the mirror should be moved towards the screen

The correct option is B
He should move the mirror slightly towards the screen

As the image distance is increased, the object distance would decrease and thus the mirror-screen distance should be decreased. Therefore, the mirror should be moved towards the screen