Ray Optics And Optical Instruments
Spherical Mirror
- Concave spherical mirror − A spherical mirror whose reflecting surface is towards the centre of the sphere is called concave spherical mirror.
- Convex spherical mirror − A spherical mirror whose reflecting surface is away from the centre of the sphere is called convex spherical mirror.
- Focal length − The distance between the pole and the principal focus of the mirror is called the focal length (f) of the mirror.
- For both the spherical mirrors the f = R/2
- Mirror formula for both the mirrors is
- For convex mirror:
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Position of object Position of object At infinity At the Focus behind the mirror Between infinity and the pole Between the pole and the focus behind the mirror - For concave mirror:
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Position of object Position of object At infinity C Beyond C Between F and C At C At C Between C and F Beyond C Beyond C At infinity Between P and F Behind the mirror
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