Question

how does a concave lens in glasses help people with
near - sightedness?
they block light from reaching the persons eyes
they compress incoming light into a singular line, like a laser.
they make distant objects appear clearer by diverging light.

Explanation:

Concave lenses are used in glasses for nearsightedness. Nearsightedness (myopia) occurs when the eye is too long or the cornea is too curved, causing light to focus in front of the retina instead of on it. Concave lenses are diverging lenses. They spread out (diverge) the incoming light rays before they enter the eye. This divergence of light causes the focal point of the light rays to move back onto the retina, allowing distant objects to be seen clearly.

• The first option “They block light from reaching the person's eyes” is incorrect because if light is blocked, the person would not be able to see at all.
• The second option “They compress incoming light into a singular line, like a laser” is incorrect. Concave lenses do not compress light into a single line. Convex lenses (which are converging lenses) can focus light to a point, but concave lenses are diverging.

Answer:

They make distant objects appear clearer by diverging light.