a) Which of the following happens in a diffraction grating? 1. Light of a single

Question

a) Which of the following happens in a diffraction grating?
1. Light of a single wavelength passes through a few closely separated slits
2. Light of a single wavelength passes through many closely separated slits
3. Light of many wavelengths passes through a few closely separated slits
4. Light of many different wavelengths passes through many closely separated slits

b) Which part of the pattern in single slit diffraction is associated with m = 0?
1. The first dark spot
2. The first predicted bright spot that is too faint to be seen
3. Trick question - there is no m = 0 in single slit diffraction
4. The central bright spot

c) For determining the resolution of an aperture, a factor of 1.22 may be introduced. Why?
1. If it is a rectangular aperture
2. If it is a circular aperture
3. The factor of 1.22 exists for all apertures
4. If it is a square aperture

Explanation / Answer

a) the answer is

1. Light of a single wavelength passes through a few closely separated slits +++++++

b) thw answer is

4. The central bright spot ++++++++++++++++++++++++++

c) the answer is

2. If it is a circular aperture +++++++++++++++++

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