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A man wishes to view an object through a...

A man wishes to view an object through a convex lens of focal length 10cm. The final image is to be eret and magnified 2 times. How far from the object must he hold the lens?

Text Solution

Verified by Experts

Here, `f=+10 cm ` and `m=+2` (Magnification is now positive as the image is erect. ) Let the object distace from the lens be x.
Then `u=-x` and `v=m u=2x`
Substituting in equation, we get
`(1)/(10)=(1)/(-2x)-(1)/(-x)` or `x=5cm`
Therefore, the lens is to be held 5 cm from the object.
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