Question

Find the power of a convex lens which forms a real and inverted image of magnification -1 of an object placed at a distance of 20cm from its optical center

Answer 1

Answer:

Given:

magnification:=-1

U ( distance of object from optical center)=-20 cm

negetive sign indicates it is on the left side of the lens

To find: power = 1/f=p

Answer:

magnification=v/u=-1

v/-20=-1

v=20

lens formula =1/v+1/u=1/f=p

1/20+1/20=p

p= 2/20=1/10=0.1

answer: 0.1 diaptors

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