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The near point of a hypermetropic person...

The near point of a hypermetropic person is `50 cm` from the eye. What is the power of the lens required to enable him to read clearly a book held at `25 cm` from the eye ?

A

2D

B

4D

C

8D

D

1D

Text Solution

Verified by Experts

The correct Answer is:
A
u=-25cm,v=-50cm, `1/f=1/v-1/u`
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(a) The near point of a hypermetropic person is at 75 cm from the eye. What is the power of the lens required to enable him to read clearly a book held at 25 cm from the eye ? (b) In what way does the corrective lens help the person above ? Does the lens magnify objects held near the eye ? ( c) The person above prefers to remove his spectacles while looking at the sky. Explain why ?

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Knowledge Check

  • The near point of hypermetropic eye is 40 cm . What is the power of the lens used to correct this defect ?

    A
    2.5 D
    B
    1.5 D
    C
    `-1.5 D `
    D
    0.5 D

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