Fewpal
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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.

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Focal length (F1) of concave lens

f = 15 cm

Image distance, v = -10 cm

As per lens formula

u = -30 cm

Negative sign indicates, image is front of the lens about 30 cm.

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