what power of a lens will change reading distance from 1 m to 0.25m?
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Using mirror formula:
Formula.
1/f = 1/v + 1/u. where fis the focal length, u is object distance.
v is distance of image.
The expression which shows the relation between u, v and f is called mirror formula for v= -0.25 u = -1cm.
you will get focal length f= -1/5
power P = -(1/f)
so p= +5D
Formula.
1/f = 1/v + 1/u. where fis the focal length, u is object distance.
v is distance of image.
The expression which shows the relation between u, v and f is called mirror formula for v= -0.25 u = -1cm.
you will get focal length f= -1/5
power P = -(1/f)
so p= +5D
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