Diffraction gratings Quiz
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5 questions, one answer each
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1. A grating has 400 lines per millimetre. What is the slit spacing?
- A. 4.0 × 10⁵ m
- B. 2.5 × 10⁻³ m
- C. 2.5 × 10⁻⁶ m
- D. 4.0 × 10⁻⁶ m
2. Light of wavelength 600 nm is incident on a grating with slit spacing 2.4 × 10⁻⁶ m. What is the angle of the first-order maximum?
- A. 14.5°
- B. 7.2°
- C. 29°
- D. 0.25°
3. Light of wavelength 550 nm is incident on a grating with slit spacing 2.0 × 10⁻⁶ m. What is the highest order that can be seen?
- A. 4
- B. 3
- C. 2
- D. 7
4. In the first-order spectrum of white light, which colour is nearest the central maximum?
- A. Red
- B. Green
- C. All colours are at the same angle
- D. Violet
5. The same laser is used with a grating of more lines per millimetre. What happens to the angle of the first-order maximum?
- A. It decreases
- B. It stays the same
- C. It increases
- D. It depends only on the distance to the screen