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Answer :
The focal length of 1.70 d reading glasses found on the rack in a drugstore is 0.588 meters or approximately 59 cm. This means that the glasses will bring the text 100 words away into sharp focus when it is held at a distance of approximately 59 cm from the eyes.
The focal length of 1.70 d reading glasses found on the rack in a drugstore can be calculated using the formula:
Focal length (m) = 1 / Power (diopters)
Here, the power (P) of the glasses is 1.70 d which means
P = 1.70 d = 1.70 m-1 (as 1 diopter is equal to 1 m-1).
Substituting the value of P in the above formula:
Focal length (m) = 1 / Power (diopters) = 1 / 1.70 m-1 = 0.588 m
Therefore, the focal length of 1.70 d reading glasses found on the rack in a drugstore is 0.588 meters or approximately 59 cm. This means that the glasses will bring the text away into sharp focus when it is held at a distance of approximately 59 cm from the eyes.
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