A 3cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 15 cm. The distance of the object from the lens is 20 cm. Find the nature, position and size of the image. Also find It’s magnification.
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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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