Question

What is the image distance of concave lens if object distance=10cm,focal length=5cm

Answer 1

1/f = 1/v + 1/u
1/5 = 1/v + 1/-10
1/5 + 1/10 = 1/v
3/10 = 1/v
v = 3.34 cm
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Answer 2

distance of object from lens =-10
focal length =+5

by using 1/v-1/u=1/f

1/v-(-1/10)=1/5
=1/v=1/5-1/10
=1/v=2-1/10
=1/v=1/10
=v=10
hence distance of image formed from concave lens =10

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