Spherical Mirror
Introduction: To obtain images of different sizes as per our requirement, it is necessary to focus parallel or divergent beams of light coming from objects. For this purpose, a plane mirror does not hold well. Instead of plane mirrors, spherical mirrors are used. Let us understand the spherical mirror in detail.
A spherical mirror is a part of a sphere that is polished from inside or outside as per our requirement.
1) Concave mirror: The mirror in which the inner surface of the mirror is made reflecting is called a Concave mirror.
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| Concave Mirror |
The concave mirror converges all the parallel light at a single point F . Thus concave mirror is also called a Converging mirror.
According to sign convention, the focal length of the concave mirror is negative.
2) Convex mirror: The mirror in which the outer surface of the mirror is made reflecting is called a convex mirror.
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| Convex mirror |
The convex mirror diverges all the parallel light from a single point F . Thus convex mirror is also called Diverging mirror.
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According to sign convention, the focal length of the convex mirror is positive.
Related Topics: Introduction to optics Laws of reflection Sign Convention Reflection from plane surface Spherical Mirror Image formed in Concave mirror Spherical Abberation Refraction Refractive Index Refraction from plane surface Lenses Refraction from Curved surface Lens makers Equation Dispersion Of Light Prism Formula
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