Diffraction at a Single Slit
Which of the following are true for a single slit diffraction?
A. Width of central maxima increases with increase in wavelength keeping slit width constant. B. Width of central maxima increases with decrease in wavelength keeping slit width constant. C. Width of central maxima increases with decrease in slit width at constant wavelength. D. Width of central maxima increases with increase in slit width at constant wavelength. E. Brightness of central maxima increases for decrease in wavelength at constant slit width.
Show answer and solution
Answer: (c)
- Width of central maximum .
- A: larger gives wider maximum, true. B: false.
- C: smaller gives wider maximum, true. D: false.
- E: smaller makes the central maximum narrower, so the same light is concentrated and it looks brighter, true.
- So the answer is (c) A, C, E only.