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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
• $\frac{1}{f}=\frac{1}{u}+\frac{1}{v}=\frac{2}{R}$
• For convex mirror:
•  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:
• … 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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