Question

23. An object of height 4 cm is placed at a distance of 15 cm in front of a concave lens of power, -10 dioptres.
Find the size of the image.
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Answer 1

Answer:

If p is the power of a lens

then P=100/f

f=-10 cm

'-' sign indicates that the lens is concave

now

1/f=1/v-1/u

1/v=-1/10-1/15

1/v=-1/6

image distance (v)=-6 cm

hi/ho=v/u

hi=-6/-15×4

hi=8/5

hi=1.6

the image size is 1.6 cm

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