Diffraction and lenses Quiz
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5 questions, one answer each
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1. Waves pass through a gap much wider than their wavelength. What happens?
- A. They spread out a lot
- B. Very little spreading happens
- C. They are all reflected
- D. Their wavelength doubles
2. Which lens is thicker in the middle and brings parallel rays together?
- A. Diverging
- B. Plane
- C. Concave
- D. Converging
3. What is the focal length of a lens?
- A. The thickness of the lens
- B. The distance from the lens to the principal focus
- C. The distance from the object to the image
- D. The width of the lens
4. Which mirror is used in a torch to produce a parallel beam?
- A. Concave
- B. Convex
- C. Plane
- D. Prism-shaped
5. A student wants a magnified, upright image with a converging lens of focal length 8 cm. Where should the object be?
- A. 12 cm from the lens
- B. 8 cm from the lens
- C. 16 cm from the lens
- D. 5 cm from the lens