Question

A 3 cm tall object is placed perpendicular to the principal axis of a convex lens of focal
length 12 cm. The distance of the object from the lens is 8cm. Find the size of the image
formed, using the lens formula.

Answer 1

Answer:

Length of object is equal to 3 cm

So according to the formula of the lens 1/f=1/v-1/u

1/15=1/v-1/-20

1/15+1/-20=1/v

4-3/60=1/v

1/60=1/v

V=60cm beyond the lens

Linear magnification m=I/O=v/u=-3

The image formed is real inverted and diminished

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