Question

A far-sighted man cannot focus distinctly on objects closer than 75 cm. What is the power of the lens that
will permit him to read from a distance of 40 cm?
solution :​

Answer 1

Answer:

Given,

Near point, v=−75cm

Reading Distance, u=−40cm

From lens formula,

• 1/f = 1/v - 1/u
• = 1/-75 - 1/-40
• = 7/600
• = 0.011

f=+0.011

Focal length of lens f=+0.011cm

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