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CBSE Class 8 Answered

explain the difference concave convex mirror or lens
Asked by radheyshyammishra | 12 Jan, 2019, 09:28: AM
answered-by-expert Expert Answer
Concave and convex mirrors are called spherical mirrors because they have curved surface cut out of a sphere,
unlike plane mirror which has plane surface.

If we assume, a curved surface mirror is part of sphere and its interior surface is polished, then this mirror is called Concave mirror.
(Surface resembles a cave). Concave mirrors are used to get real,  inverted and magnified image.
Magnification depends on the position of object.

If we assume, a curved surface mirror is part of sphere and its exterior surface is polished, then this mirror is called Convex mirror.
 Convex mirrors are used to get virtual,  erect and  diminished image.
 
Convex lens is called converging lens, because it converges the parallel rays to focus point. It is thick at middle and thin at circumference edge.
Convex lens gives real and inverted image. Magnification depends on position of object.
 
Concave lens is called diverging lens, because parallel rays coming from distant objects are getting diverged and it appears as if the rays are coming from focal point as shown in figure. It is thinner at middle and thicker at circumference edge. Concave lens gives virtual , erect and always diminished image.

Answered by Thiyagarajan K | 12 Jan, 2019, 06:40: PM
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