Answer: (d) Concave mirror, convex mirror, concave lens and convex lens
A highly diminished picture is generated at the focus when rays of light from infinity hit a concave mirror, convex mirror, concave lens, or convex lens.
- A convex lens is a lens with an outward curve.
- The thickness at the centre of a convex lens is more than the thickness at the edges of the lens.
- Convex lenses are converging lenses. They have the ability to converge a parallel beam of light into a point.
- The lens found in the human eye is a prime example of a convex lens.
- Another common example of a convex lens is the magnifying glass that is used to correct Hypermetropia or long-sightedness.
- A concave lens is a type of lens with at least one side curved inwards.
- A concave lens with both sides curved inward is known as a biconcave lens.
- Concave lenses are diverging lenses, that is, they spread out light rays that have been refracted through them.
- They have the ability to diverge a parallel beam of light.
- For a concave lens, the edges are wider than the centre or the centre is thinner than the edges.
- Concave lenses are used in spectacles in order to overcome myopia or short-sightedness.
In the case of a concave mirror, an image may be real or virtual, inverted or erect and magnified or diminished depending upon the position of the object.
In the case of a convex mirror, an image formed will always be virtual, erect and diminished in spite of the position of the object.