ICSE BoardEnglish MediumSTD 8PHYSICSLight Energy5 Marks
Question
What do you mean by a spherical mirror? Distinguish between a concave mirror and a convex mirror. .
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Answer
A spherical mirror is a part of a hollow glass sphere with one of its curved surfaces polished in silver while the
Concave mirror :
It is a spherical mirror whose inner surface $($curving inwards$)$ is the reflecting surface and the outer surface $($bulging outwards$)$ is polished.
When a parallel beam of light falls on this mirror, it converges at a point after reflection.
It is also known as converging mirror.
It can form real or virtual image depending on the position of the object with respect to the mirror.
Convex mirror :
It is a spherical mirror whose outer surface is the reflecting surface and the inner surface is polished.
When a parallel beam of light falls on this mirror,
it appears diverge from a point after reflection.
It is also known as diverging mirror.
It always form a virtual, erect and diminished image of the object irrespective of the position of the object with respect to the mirror.
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