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The Human Eye and Colourful World

The far point of a myopic person is 80 cm in front of the eye.

Science

Class 10

NCERT

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A person needs a lens of power

- 5.5

dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power

+ 1.5

dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?

The far point of a myopic person is

80 c m

in front of the eye. What is the nature and power of lens required to correct the problem?

Make a diagram to show how hypermetropia is corrected. The near point of hypermetropic eye is 1 m. What is the power of lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

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Question

Hard

Solving time: 4 mins

The far point of a myopic person is $80 c m$ in front of the eye. What is the nature and power of lens required to correct the problem?

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Updated on: Feb 29, 2024

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Science (NCERT)

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The far point of a myopic person is

80 c m

in front of the eye. What is the nature and power of lens required to correct the problem?

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Text solutionVerified

The person is suffering from myopia and hence need a concave lens to correct the defect. The lens should be such that an object at infinity must form its image at the far point.

Hence, $f = - 80 c m = - 0.8 m$

The power of the lens can be obtained as:

$P = \frac{1}{f}$

$P = \frac{1}{( - 0.8 )} = - 1.25 D$

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Practice more questions from Science (NCERT)

A person needs a lens of power

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dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power

+ 1.5

dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?

The far point of a myopic person is

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in front of the eye. What is the nature and power of lens required to correct the problem?

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Question Text	The far point of a myopic person is $80 c m$ in front of the eye. What is the nature and power of lens required to correct the problem?
Updated On	Feb 29, 2024
Topic	The Human Eye and Colourful World
Subject	Science
Class	Class 10
Answer Type	Text solution:1 Video solution: 27
Upvotes	2849
Avg. Video Duration	4 min

The far point of a myopic person is $80 c m$ in front of the eye. What is the nature and power of lens required to correct the problem?

Text solutionVerified

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