To calculate the power of a convex lens of focal length 20 cm, we can use the formula:
Power (P) = 1 / focal length (f)
where the focal length is measured in meters.
Converting the focal length of 20 cm to meters, we get:
f = 20 cm = 0.2 m
Using the formula above, we can find the power:
P = 1 / 0.2 m = 5 diopters (D)
Therefore, the power of the convex lens of focal length 20 cm is 5 diopters.
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