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A boy uses spectacles of focal length -50 cm. Name the defect of the vision he is suffering from.

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in Physics – Class 12 by (135k points)
A boy uses spectacles of focal length -50 cm. Name the defect of the vision he is suffering from.

(a) Astigmatism

(b) Hypermetropia

(c) Myopia

(d) Presbyopia

The question was posed to me in quiz.

I want to ask this question from Optical Instruments topic in portion Ray Optics and Optical Instruments of Physics – Class 12

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The correct choice is (c) Myopia

For explanation I would say: As the focal length is negative, the lens used is concave. When a person is prescribed a concave lens, then the person is considered to be suffering from myopic. Therefore, the boy is suffering from myopia.

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