A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Answers (1)

Focal length, f = -15 cm

Image distance, v = -10 cm ( As in case of the concave lens image is formed on the same side as the object is placed)

Let the object distance be u. 

As per the lens formula

\frac1f=frac1v-frac1u\ frac1u=frac1v-frac1f\ frac1u=frac1-10-frac1-25\ v=-30 cm

The object is placed at a distance of 30 cm from the lens.

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