Question

a 1.5cm long pin is placed normal to the principal axis of a converging lens of focal length 0.12m.The distance of the pin from the lens is 0.15m.Find the size and nature of the image
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Answer 1

Answer:

Distance of object from mirror u=−8cm

Focal length f=12cm

We know for mirror,

f

1

=

v

1

+

u

1

12

1

=

v

1

+

−8

1

Distance of image from lens v=4.8cm

Magnification ratio m=−

u

v

=−

−8

4.8

=0.6

Height of object h=1.2cm

Height of the image h

i

=m×h=0.6×1.2=0.72cm