The image of a distant object is obtained on a screen by using a concave mirror. The focal length of the mirror can be determined by measuring the distance between :

the object and the mirror

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the object and the screen

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the mirror and the screen

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the mirror and the screen as well as that between the object and the screen

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Solution

The correct option is B the mirror and the screen
For an object at infinity, all the paraxial rays after reflection from the concave mirror will pass through the focus, thus the image is formed at focus. Hence the focal length of the concave mirror can be determined by measuring the distance between the screen and the mirror.

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Similar questions

The image of a distant object is obtained on a screen by using a concave mirror. the focal length of the mirror can be determined by measuring the distant between

A) the object and the mirror

B) the object and the screen

C) the mirror and the screen

D) the mirror and the screen as well as the between the object and the screen

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