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Refraction at Curved Surfaces

Santosh is dr...

Question

Santosh is driving a car. He finds it difficult to read the speedometer but he can clearly see the distant road signs. Which eye defect he is suffering from and what lens he is supposed to use?

A

Myopia; Convex

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B

Myopia; Concave

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C

Hypermetropia; Convex

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D

Hypermetropia; Concave

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Solution

The correct option is C Hypermetropia; Convex

Santosh is suffering from Hypermetropia as he cannot see closer objects clearly.

Patients with hypermetropia will be prescribed eyeglasses or contact lens with a convex (positively powered) lens in front of a hypermetropic eye allowing the image to move forward and focus correctly on retina.

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Long sight or myopia is a defect in the eye that is more common in old age. People suffering from this defect can read a book clearly, but find it difficult to see a distant road sign. The image of the object, instead of forming in front of the retina, forms behind it. This defect can be corrected by using a convex or a diverging lens.

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