Question

A concave lens of focal length 15 cm forms an image 10 cm from the lens . How far is the object placed from the lens ? Draw its ray diagram

Answer 1

Answer:

f=15cm(-ve)

v=10cm(-ve)

1/f=1/v-1/u

1/-15= 1/-10 -1/u

1/u=1/-10 - 1/-15

1/u= (15-10)/-150

1/u=5/-150

=1/-30

Therefore, u=30 cm(-ve)

Answer 2

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Hope it Helps !!