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Q.

A concave mirror is placed 15 cm away from an object. If u stands for the object distance then which of the following is true?

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a

$u = \pm 15 cm$

b

$u = +15 cm$

c

$u = + 30 cm$

d

$u = - 15 cm$

answer is C.

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Detailed Solution

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According to the sign conventions used for spherical mirrors, the object is always considered to be placed on the left side of the mirror.
Therefore, the object distance is always taken as negative.

Hence u= -15 cm is the correct response.

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A concave mirror is placed 15 cm away from an object. If u stands for the object distance then which of the following is true?