Question

A myopic adult has a far point at 0.1 m. What power lenses are required to see distant objects?

[Take the image distance from the lens of the eye to the retina to be 2cm]

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Answer 1

Answer:

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Answer 2

Given:

The far point of the eye, u = -0.1 m

Image distance, v = 2 cm = 0.02 m

To Find:

The power of lenses required to correct the vision.

Calculation:

- Power of the eye lens:

P = 1/f = (1/v) - (1/u)

=> P = (1/0.02) - (1/-0.1)

=> P = 50 + 10 = 60 D

- When lenses are used, far point shifts to infinity.

=> u' = ∞

- Power with glasses:

P' = 1/f' = (1/v) - (1/u')

=> P' = (1/0.02) - (1/∞)

=> P' = 50 D

- Power of lenses = Power with glasses - Power of eye

=> P = 50 - 60

=> P = - 10 D

- So, the power of lenses required to correct the vision of the eye is -10 D.