Question

Please help me with 10th question. I have my revision exam tomorrow...

Answer 1

the lens which have both concave and convex lens.
it use for both myopia and hytromyopia

Answer 2

$\huge\mathbb{\blue{hey\:mate}}$here is your answer
Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.