define cocave mirror explanation in brief
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Answer:
Concave Mirror
If a hollow sphere is cut into parts and the outer surface of the cut part is painted, then it becomes a mirror with its inner surface as the reflecting surface. This type of mirror is known as a concave mirror.
Characteristics of Concave Mirrors
Light converges at a point when it strikes and reflects back from the reflecting surface of the concave mirror. Hence, it is also known as a converging mirror.
When the concave mirror is placed very close to the object, a magnified and virtual image is obtained.
However, if we increase the distance between the object and the mirror then the size of the image reduces and a real image is formed.
The image formed by the concave mirror can be small or large or can be real or virtual.
a toy consisting of a tube containing mirrors and pieces of coloured glass or paper, whose reflections produce changing patterns when the tube is rotated is known as kaleidoscope