As shown in figure `AB` represents an infinite wall tangential to a horizontal semi circular track.
Channel: Doubtnut
Date: 2020-02-16

As shown in figure `AB` represents an infinite wall tangential to a horizontal semi circular track.`O` is a point source of light on the ground at the centre of the circle. A block moves along the circular track with speed `v` starting from the point where the wall touches the circle. If the velocity and acceleration of shadow along the length of the wall is respectively `\'V\'` and `\'a\'` then,