If, time appears in the mirror is 11 : 09, then what time will be in the clock ?

The correct answer is (a).

When you look at a clock in a mirror, the numbers appear to be reversed. So, if the time on the clock is 11:09, the time in the mirror will be 1:51.

Here is a diagram to illustrate this:

The numbers on the clock are reversed in the mirror because the mirror reflects light in a way that reverses the left-right orientation of objects. This is known as lateral inversion.

I hope this helps!