Question:medium

If the distances of the object and its real image from the principal focus of a concave mirror are 16 cm and 9 cm respectively, then the focal length of the mirror is

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Newton's formula, $f^2 = x_1 x_2$, is a powerful shortcut for problems where distances are given relative to the focus, not the pole. It is much faster than using the standard mirror formula $1/f = 1/v + 1/u$ in these specific cases.

Updated On: Mar 30, 2026

30 cm
12 cm
18 cm
24 cm

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The Correct Option is B

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If the distances of the object and its real image from the principal focus of a concave mirror are 16 cm and 9 cm respectively, then the focal length of the mirror is

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The Correct Option is B

Solution and Explanation

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