﻿ A clock hung on a wall has marks instead of numerals on its dial. On the adjoining wall, there is a plane mirror and the image of the clock in the mirror indicated the time 7.10. Then the time on the clock is:  : Kaysons Education

A Clock Hung On A Wall Has Marks Instead Of Numerals On Its Dial. On The Adjoining Wall, There Is A Plane Mirror And The Image Of The Clock In The Mirror Indicated The Time 7.10. Then The Time On The Clock Is:

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Question

Solution

Correct option is

4.50

The image in a plane mirror undergoes depth inversion; hence the time on the image is as much ahead of 12 hours zero minutes as the time on actual clock is behind 12 hours zero minutes.

Time on the actual clock = 7 hours 10 minutes

Time on the image clock

= (12 hrs and zero minutes) – (7 hrs and 10 minutes)

= 4 hrs and 50 minutes.

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