MCQ practice · SSC Physics Board questions · Chapter 8: Reflection of Light
At how many degrees to each other must two mirrors be placed, used as one mirror, so that left and right are not interchanged?
Think it through first, then pick an option.
- a 45°
- b 60°
- c 90°
- d 120°
Answer and explanation
Correct answer: c 90°
When two mirrors at 90° are used as one mirror, the image of one is reflected again in the other and set right, so left and right are not interchanged.
Why the other options are wrong
- a 45°: This is not the answer: When two mirrors at 90° are used as one mirror, the image of one is reflected again in the other and set right, so left and right are not interchanged.
- b 60°: This is not the answer: When two mirrors at 90° are used as one mirror, the image of one is reflected again in the other and set right, so left and right are not interchanged.
- d 120°: This is not the answer: When two mirrors at 90° are used as one mirror, the image of one is reflected again in the other and set right, so left and right are not interchanged.
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