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Chapter 26: Q17PE (page 956)

Repeat the previous problem for eyeglasses held 1.50 cm from the eyes.

Short Answer

Expert verified

The power of vision of a myopic man must be reduced (corrected) by 5.41 D.

Step by step solution

01

Definition of dioptre lens

The unit of measurement for the optical power of a lens or curved mirror is the dioptre of power of a lens, which is equal to the reciprocal of focal length.

02

Given information and Formula to be used

di=1.50cm-20.00cm=-18.5cm1m100m=-18.5×10-2md0=∞

The power needed (P) to correct the vision can be obtained using the expression,

P=1d0+1di…………..(1)

03

What power contact lens (when on the eye) will correct his distant vision?

When the given data values are substituted into equation (1), the following results are obtained:

P=1∞+1-18.5×10-2m=0-5.41D=-5.41D

Therefore, according to result (2), a myopic man's visual power P with spectacles must be reduced (or corrected) by 5.41 D.

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