Question

15. A concave lens has a focal length of 15 cm. At what distance should the object from
the lens be placed, so that it forms an image at 10 cm from the lens? Also find the
magnification of the image
​

Answer 1

Answer:

f=15cm

u =?

v =10cm

1/f =1/u-1/v

1/15 =1/u - 1/10

1/u =1/15+1/10

1/u =2+3/30

1/u =5/30

1/u =1/30

u=-30cm

magnification =v/u

= 10/30

= -3

Explanation:

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