Question

# An object is placed at a distance of 20 cm in front of a concave mirror of focal length 10 cm. Calculate the image distance (in cm).-20

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Solution

## The correct option is A -20 Using the sign conventions for spherical mirrors, Object distance, u = -20 cm Focal length, f = -10 cm Using the mirror formula, 1f=1v+1u 1−10=1v+1−20 ⇒ v = -20

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