Concept:Short sightedness, or myopia, is corrected using a diverging lens that shifts the image back onto the retina.
Explanation:In a short sighted eye, light rays from distant objects converge too early. As a result, the image is formed in front of the retina, making distant objects look blurry.
To fix this, the eye needs a lens that spreads the rays outward before they enter the eye.
A concave lens diverges parallel light rays. This causes the rays to meet later, so the image falls exactly on the retina.
Therefore, a concave lens is the correct optical device for this correction.
Answer:B. concave lens