Question

if magnification of lens is2. 5 then _image is formed​

Answer 1

What is the magnification of a convex lens when the image of an object is formed at its focal point?


For lenses with small aperture

m = v/u

the image is formed at the focus so v = f

1/v -1/u = 1/f (lens formula)

solving for u we get

1/u = 0

this is a reflection of the fact that the focus is not a point but a region

in reality f is not a constant and the lens formula is just an approximation of sorts that works well for lenses with small aperture

hence m which is v/u is a very small number that can be approximated to 0 but not actually zero

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