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What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm?

What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm?

Grade:11

1 Answers

Vikas TU
14149 Points
9 months ago
For the normal person, least distance of distinct vision is 25 cm. But given person have least distance of distinct vision as 50 cm. So u = -25 cm and v = -50 cm.
Using lens formula,
1/f = 1/v - 1/u
1/f = 1/-50 - 1/-25
1/f = -1/50 + 2/50
1/f = 1/50
f = +50 cm
Hence, focal length of reading glasses should be +50 cm. i.e. convex lens.
 

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