Question

What focal length should the spectacles have for a person for whom the least
distance of distinct vision is 50 cm?
(1) 50 cm, concave
(2) 50 cm, convex
(3) 25 cm, concave
(4) 25 cm, convex​

Answer 1

Answer:

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What focal length should the spectacles have for a person for whom the least

distance of distinct vision is 50 cm?

(1) 50 cm, concave

(2) 50 cm, convex

(3) 25 cm, concave

(4) 25 cm, convex✔