Question

A girl uses spectacles of focal length +10cm name the defect of vision she is suffering from compute the power of the lens

Answer 1

The defect of the vision is Farsightedness(Hypermetropia).

Answer 2

Here the focal length is positive. Convex lens has it's focal length as positive, moreover we use convex lens for correcting HYPERMETROPIA otherwise known as FAR SIGHTEDNESS. So it is clear that she is suffering from hypermetropia.

Power = 1/focal length

Power = 1/+10

Power = 0.1D

Therefore the power of the lens is 0.1Dioptre

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