Question

a concave lens of focal length 20cm forms an image 10cm from the lens how far is object placed from the lens?draw ray diagram?​

Answer 1

Explanation:

f= -20cm

v= -10cm

u=?

formula used= 1/f= 1/v+1/u

therefore,

-1/20= -1/10+1/I

1/u=1/20-1/10=> 1-2/20= -1/20

therefore, u= -20cm.

Answer 2

Answer:

f= -20cm

v= -10cm

u=?

formula used= 1/f= 1/v+1/u

-1/20= -1/10+1/I

1/u=1/20-1/10=> 1-2/20= -1/20

u= -20cm.

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