A concave dish, more specifically parabolic or spherical, will focus any parallel rays toward the focal point of the curve. This allows the fish to collect a signal from a large area and focus it into a small area (electronic sensor)
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Convex . . . "curved out", like the outside of a balloon, the outside of a smooth hubcap, and the top of a half-eaten ice-cream cone. Concave . . . "curved in", like the top of the ice-cream in the tub after the first five cones have been scooped out, the mark a rock makes in snow, and the inside of a soup bowl.
It depends on the uses the lens are going to be put to. A lens may have a convex front and a flat back, or a convex front and a concave back, or even a convex surface on both front and back. Or even concave on both the front and back.Concave means bowed inwards.Convex means bowed outwards.
The best example would be to take a metal spoon that is shiny. Look at the spoon so the curved part is facing away from you. The dip you can see is called Concave. The other side that protrudes is called Convex. When you look at the concave side your face will appear squashed, wider at the top and bottom but very narrow in the middle. When you look at the convex side, your face will appear wide and fatter, almost like a football. This is because of the light rays reflective at a different angle.
no because its not curved
No, a concave polygon cannot be a regular polygon.