an object 40 cm from a lens ,forms an image also at 40 cm from the object but on the opposite side.find the focal length of the lens and the type of lens.
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Answer:
focal length=20
it is a convex lens
Explanation:
An object forms an image of same size only in covex lens when placed in 2F on the opposite side.
So 2F= 40 cm
F=40/2cm = 20cm
here F= Focal length
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