In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

These two defects are treated with spectacle lenses, which refract (bend ... Short-sightedness can be corrected by placing a concave lens in front of the eye, as shown in the diagrams below.

A refractive index of 2.42 indicates that diamond ... Question 3: Find the power of a concave lens of focal length 2 m Answer: Power of a lens is a measure of how strongly it can bend light.