Question

If far point of a person is 5m then what's the focal point of the lens to be used

Answer 1

since the far point is less than infinity he ce we need to firm the image of object place at infinity at 5m

u = infinty or 1/u = 0

now 1/f = 1/v - 1/u = 1/f = 1/5

f = 5m

Answer 2

Answer:

concave lens

Explanation:

because if a object is far from the person