MCQ practice · SSC Physics Board questions · Chapter 8: Reflection of Light
At what angle must a red rose be placed in front of a mirror to look brightest?
Think it through first, then pick an option.
- a 30°
- b 45°
- c 60°
- d 75°
Answer and explanation
Correct answer: d 75°
The larger the angle of incidence, the more the reflection (Fresnel's law). Of the four, 75° is the largest and close to 80°, where reflection rises steeply, so the rose looks brightest there.
Why the other options are wrong
- a 30°: This is not the answer: The larger the angle of incidence, the more the reflection. 30° is smaller than 75°, so less light is reflected here.
- b 45°: This is not the answer: The larger the angle of incidence, the more the reflection. 45° is smaller than 75°, so less light is reflected here.
- c 60°: This is not the answer: The larger the angle of incidence, the more the reflection. 60° is smaller than 75°, so less light is reflected here.
More board questions on this topic
- How much light is reflected from an ordinary piece of glass?
- What colour does a green flower look in red light?
- Reflection of light depends-
- A red rose looks red because-
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