Question

You are given a concave mirror of focal length 10 cm, a point source of light and a screen placed at distance 30 cm in front of mirror. How can you obtain a bright patch of light on screen of size equal to that of the aperture of mirror? Draw diagram to explain your answer

Answer 1

Explanation:

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Refer to the attachment above ❤

Answer 2

Principal focus of a concave mirror is a point where light rays parallel to principle axis converge. The distance between pole of mirror to point of principle focus is focal length of mirror.