Question

amswer with solution



A concave lens produce an image 20 cm from the lens of an object placed 30 cm the lens . find the focal lenght​

Answer 1

u=20

v=30

formula:

1/f=1/v+1/u

1/f =1/30+1/20

1/f=3-2/60. {LCM}

1/f=1/60

f=60 cm...

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