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Calculate two possible distances of an o...

Calculate two possible distances of an object from a convex lens of focal length 20 cm so as to obtain an image of double the size of the object.

Text Solution

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f=20 cm
case 1
when m=+2
v/u=+2
v=+2u
using lens formula we find u=-10 cm
case 2
when m=-2 similarly
we get u=-30 cm
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