Question

ii) A person needs a lens of power-6D for
correcting his distant vision. for correcting
his near vision, he needs a lens of power +
2D. find the focal length of the lens and its
nature required for correcting his distant &
near vision separately.

Answer 1

Answer:for correcting his distant vision he need concave lens

For correcting his near vision he need convex lens

Explanation:

For distant vision

P=1/f(m) or 100/f(cm)

P=100/-6=(-50/3)cm

For near vision

P=100/2=50cm