Difference Between Concave and Convex Mirror

Spherical mirrors are curved mirrors cut from a hollow sphere of glass. Based on which side is polished and which side is reflecting, they are divided into Concave and Convex mirrors.

Question (Click to Flip)

What is the main difference between a concave and convex mirror?

Answer

A concave mirror has its reflecting surface curved inwards and can form both real and virtual images. A convex mirror has its reflecting surface curved outwards and forms only virtual, erect, and smaller images.

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Key Facts

Concave: Curves inward, Converging, Forms Real & Virtual images.

Convex: Curves outward, Diverging, Forms ONLY Virtual & Diminished images.

Use of Concave: Car headlights, dentist mirrors.

Use of Convex: Rear-view mirrors in cars/bikes.

1. Shape and Reflection

Concave Mirror: The reflecting surface is curved inwards (looks like a 'cave'). The outer bulging side is painted/polished.
Convex Mirror: The reflecting surface is curved outwards (bulging out). The inner cave-like side is painted/polished.

2. Light Behaviour

Concave Mirror (Converging): It converges (brings together) parallel light rays to a single real focus point in front of the mirror.
Convex Mirror (Diverging): It diverges (spreads out) parallel light rays. The rays appear to come from a virtual focus point behind the mirror.

3. Image Formation

Feature	Concave Mirror	Convex Mirror
Type of Image	Can form both Real & Virtual images.	Forms ONLY Virtual images.
Orientation	Can be Inverted (if real) or Erect (if virtual).	ALWAYS Erect (upright).
Size of Image	Can be Magnified, same size, or diminished depending on distance.	ALWAYS Diminished (smaller than object).

4. Common Uses

Concave Uses: Shaving/Makeup mirrors (gives magnified erect image when close), Dentist mirrors, Headlights of cars (to throw a strong parallel beam).
Convex Uses: Rear-view mirrors in vehicles (gives a wider field of view and always upright images), security mirrors in shops/corners.

Questions and Answers

What is the main difference between a concave and convex mirror?+

Which mirror is used as a rear-view mirror in vehicles and why?+

A convex mirror is used as a rear-view mirror because it always forms an erect (upright) image and provides a much wider field of view, helping the driver see more traffic behind them.

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