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Define machine
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A machine (or mechanical device) is a mechanical structure that uses power to apply forces and control movement to perform an intended action. Machines can be driven by animals and people, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement.
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a. If the image formed is erect, of same size, and at
equal distance behind the mirror as object and is
in front of the mirror, then mirror is plane.
b. If the image is of larger size and erect and changes
to inverted and smaller size by changing the
position of mirror from the object it is concave
mirror.
c. If the image is smaller and erect for all positions
of mirror from the object, it is a convex mirror.
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