Question

A concave lens has focal length of 12cm. At what distance
should the object be placed from the lens so that it forms an image
8cm from the lens.

a..u= 24cm

b..u= 5.6cm

c..u = -17.5cm

d...u= -24cm​

Answer 1

f = 12

v = 8

1/f =1/v-1/u

1/u=1/v-1/f

1/u=1/8-1/12

1/u= 3-2/12

1/u=1/12

u=12

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