Question

57. A clock fixed on a wall shows time 04:25:37. Its image in a plane mirror shows
(a) 07:30:33 (6) 07:43 : 32 (c) 07:35 : 22 (d) 43 : 27 : 36​

Answer 1

Explanation:

The image of an object as seen in a mirror is the mirror image. The object having bilateral symmetry will have its mirror image similar to the object. In the case of a clock it has bilateral symmetry but the time will be different from the actual time.

In actual time the hour hand points at 4 . The minute hand shows 25 , that it points at 5 . The second hand shows 37 , that is between 35 and 40 . Therefore it points between 7 and 8 .

Now let’s think about the reflected image. The hour hand will be reflected and pointed at 7 . The minutes hand will be reflected and pointed at 7 because 5and 7 are the adjacent numbers of 6. This implies 35 minutes. The seconds hand will reflect and point between 4 and 5 . That is between 20 and 25 . We can take the value as 23 .

Thus the time the image in the plane mirror shows 07:35:23.

The answer is option C.

Note:-

Alternative method: One of the easier ways to find the mirror image of time is to subtract the given time from 11:60:60 . Thus subtracting each separately , 11−04=07, 60−25=35 , 60−37=23

Hence the mirror image of time is 07:35:23.