Question

difference between concave lens and convex lens atleast 3 points with examples

Answer 1

 Concave                                              ConvexStructureA concave lens is thinner in the middle and thicker at the edges.A convex lens is thicker in the middle and thinner at the edges.Other nameDiverging LensConverging LensImages FormedVirtual, upright and smaller than the object between object and the lens. (regardless of the object's position)Real , inverted, smaller than object, - object at FReal , inverted, same size as object, - object at 2FReal , inverted, larger than  object, object between 2F and FNo image -  object at FVirtual, upright, larger than object – behind object on the same side of the lensMeaningConcave means “hollowed or rounded”.Convex means “curved or rounded like the outside of a sphere or circle”.In SpectaclesUsed for the correction of problem in short sight.Used for the correction of problem in long sight.ApplicationsGlasses (to correct for short sight), spy holes in doors, some telescopes, back window of coaches, etc.Eye, camera, overhead projector, focus sunlight, projector microscope, simple telescope, glasses (to correct for long sight), magnifying glass, etc.Focal LengthNegativePositive

Answer 2

Convex lenses are thicker at the middle. Rays of light that pass through the lens are brought closer together (they converge). A convex lens is a converging lens.

When parallel rays of light pass through a convex lens, the refracted rays converge at thefocal point. The image formed is magnified (you can use this lens as a magnifier, or a simple camera lens by itself). It’s also called “positive” lens.



Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens.

When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called theprincipal focus. The image formed is diminished. It’s also called “negative” lens. This lens can’t be used to form an image by itself, but in combination(s) with positive (converging) lenses it is used to shorten the focal length.