a convex lens of focal length 20cm from an object one fourth of the size of the object then the position of the image from the object.
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Answer:
Given f=20cm
m=1/2
but,m=-v/u
1/2=-v/u
v=-u/2
1/v=-2/u
We know 1/f=1/u+1/v
=1/20=1/u-2/u
=-1/u=1/20
=u=-20
The answer is 20 cm behind the lens.
Explanation:
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