MCQ practice · SSC Physics Board questions · Chapter 8: Reflection of Light
An object of 5 cm is placed in front of a concave mirror and its image is 2 cm. What is the magnification of the object?
Think it through first, then pick an option.
- a 0.1
- b 0.2
- c 0.3
- d 0.4
Answer and explanation
Correct answer: d 0.4
The magnification is m = l′/l = 2/5 = 0.4. The image is smaller than the object, so m < 1.
Why the other options are wrong
- a 0.1: This is not the answer: The magnification is m = l′/l = 2/5 = 0.4. The image is smaller than the object, so m < 1.
- b 0.2: This is not the answer: The magnification is m = l′/l = 2/5 = 0.4. The image is smaller than the object, so m < 1.
- c 0.3: This is not the answer: The magnification is m = l′/l = 2/5 = 0.4. The image is smaller than the object, so m < 1.
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