Question

A clock indicates a time 3 : 25 . One seeing it in a plane mirror , the time appears as

Answer 1

The image on the plane mirror would be laterally inverted

1 hr division= 30 degree

3 hr division = 3x30 degree = 90 degree

Angle with the lateral axis 180 degree – 90 degree = 90 degree

Angle between the hour’s hand at 3’o clock and the lateral axis of the watch = 90 degree

Now in the image the hand will make 90 degree at the left side of the lateral axis.

So the image hand will be 90 degree clockwise from the current position or 180 degree + 90 degree = 270 degree from 0

1 degree= 1/30 hr division

270 degree = 270 degree/30 hr division = 9, that corresponds to 9’ o clock

Similarly, the minute’s hand at 25 makes 30 degree with the axis and the image will appear 60 degree away from the current position that corresponds to 35 minutes.

So the image clock will show 9 hr 35 minutes.

Answer 2

A clock indicates time 3:25 and seeing it in a plane mirror it appears to be 9:35