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Mr. Barnabas is near sighted and has a far point located at 85 cm from his eye. Assuming that he wears his eyeglasses 2 cm in front of his eye, determine the focal length of his glasses, so that he can see distant objects?

Select one:

a. -85 cm

b. 85 cm

c. -83 cm

d. 83 cm

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Answer:

-83 cm

Explanation:

The equation to calculate focal length in near sightedness is f = -(D_F - D_L)

Where, D_F is the far point and D_L is the distance from eye to the lens

Given, D_F = 85 cm and D_L = 2 cm

Therefore, f = -(D_F - D_L)

= -(85 - 2) cm

= -83 cm

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