Theory of Machine
Cam angle is defined as the angle

Through which, the cam rotates during the period in which the follower remains in the highest position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
During which the follower returns to its initial position
Of rotation of the cam for a definite displacement of the follower

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Theory of Machine
The inversion of a mechanism is

Obtained by reversing the input and output motion
Changing of a higher pair to a lower pair
Obtained by fixing different links in a kinematic chain
Turning its upside down

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