Lenses and Visible Light Quiz
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5 questions, one answer each
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1. How does a lens form an image?
- A. A. By reflecting light
- B. B. By refracting light
- C. C. By absorbing light
- D. D. By emitting light
2. What type of image does a concave lens always produce?
- A. A. Real image
- B. B. Virtual image
- C. C. Inverted real image
- D. D. No image at all
3. An object 5 cm tall produces an image 20 cm tall. What is the magnification?
- A. A. 0.25
- B. B. 4
- C. C. 15
- D. D. 100
4. Why does a red apple appear red in white light?
- A. A. It absorbs red wavelengths and reflects all others
- B. B. It reflects red wavelengths of light and absorbs the others
- C. C. It emits red light itself
- D. D. It transmits all wavelengths equally
5. A photographer notices that a mirror produces a sharp, clear reflection while a sheet of white paper reflects light but produces no clear image. What explains this difference?
- A. A. The mirror absorbs more light than the paper
- B. B. The mirror gives specular reflection (smooth surface); the paper gives diffuse reflection (rough surface)
- C. C. The paper is transparent while the mirror is translucent
- D. D. The mirror transmits light while the paper reflects it