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Mr
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
Expert Solution
Answer:
-83 cm
Explanation:
The equation to calculate focal length in near sightedness is f = -(DF - DL)
Where, DF is the far point and DL is the distance from eye to the lens
Given, DF = 85 cm and DL = 2 cm
Therefore, f = -(DF - DL)
= -(85 - 2) cm
= -83 cm
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