Here,
focal length f = 20 cm = 0.2 m
power p = ??
we kniow that ,
power p = 1/f
1/ 0.2
= 5 D
hence the power of lens is five dioptre.
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Prapti uses a convex lens of focal length 20 cm in her spectacles. Find the power of lens.
Here,
focal length f = 20 cm = 0.2 m
power p = ??
we kniow that ,
power p = 1/f
1/ 0.2
= 5 D
hence the power of lens is five dioptre.
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