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Q19
(CAPF/2021)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Geometrical optics
Answer Verified
The following figure shows the image of a clock in a plane mirror : Which one of the following is the correct time?
Result
Your answer:
—
·
Correct:
D
Explanation
A plane mirror creates an image through lateral inversion, where the left side of the object appears as the right side of the image and vice versa [1]. To determine the actual time from a mirror image of an analog clock, the standard rule is to subtract the reflected time from 11:60 (or 12:00). In the provided image, the clock hands appear to show approximately 2:35 (with the hour hand between 2 and 3 and the minute hand at 7). Applying the formula: 11:60 - 2:35 = 9:25. Alternatively, visualizing the lateral reversal, the minute hand at the 7 o'clock position (35 minutes) reflects to the 5 o'clock position (25 minutes), and the hour hand between 2 and 3 reflects to a position between 9 and 10. Thus, the correct actual time is 9:25.
Sources
- [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 11: Light: Shadows and Reflections > Activity 11.8: Let us experiment > p. 162
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