Question

Size of the image of an object by a concave lens of focal length 20 cm is observed to be reduced to 12 of its size. Find the distance of the object from the lens.​

Answer 1

Answer:

Explanation:

Focal length f = -20 cm

Magnification

We know that,

The magnification is

......(I)

Using lens formula

Put the value of v in equation (I)

Hence, The distance of the object is 40 cm from the lens.

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