Spherical mirrors are the mirrors which have the shape of piece cut out of a spherical surface. The surface may be either curved inwards or outwards. Spherical mirrors can be of two types: Convex mirror and concave mirror.
Concave mirror: A spherical mirror whose reflecting surface faces towards the center of the sphere i.e., curved inwards is known as concave mirror.
Convex mirror: A spherical mirror with reflecting surface curved outwards is known as convex mirror.
Use of concave mirror:
- Satellite Dishes: One of the most important use of concave mirror is satellite dishes. These are used to receive the weaker signals sent from the communication satellites and then amplify it. These signals strikes the concave mirror in parallel rays and gets reflected back. These reflected rays are concentrated at the focus of the mirror. The main purpose of this mirror is to gather weaker signals coming from large areas and concentrate them at one point.
- Headlights in car: A powerful source of light is kept at the focus point of the concave mirror in a smaller space at the back of the headlight. Any light striking the mirror from focus will get reflected parallel to the axis of the concave mirror.
- Shaving mirror: Another use of concave mirror is shaving mirror. The image formed after the reflections of the concave mirrors is helpful for people while shaving.
- Dentist’s mirror: The concave mirrors helps the dentist to focus light on the tooth to be examined.
Uses of convex mirrors:
- Rear view mirror: The side view mirror of car forms a small and erect image with the help of convex mirrors which helps to see the way behind the car.
- Security mirrors in ATM: Security mirrors are kept near the ATM’s so that the bank customer can check that somebody is behind them or not.
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