Concave lens of focal distance is 20 cm its power in diopters
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Power of a lens is the reciprocal of the focal length in meters
So power =1/.2 = 5D
So power =1/.2 = 5D
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Answer:frictional force depends upon the types of surface in contact and the weight of the object resting on the surface
Explanation:
frictional force depends upon the types of surface in contact and the weight of the object resting on the surface
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