Diffraction fringes are____________________?
Correct answer: C. distance between then decreases
- A. equally spaced
- B. distance between them increases
- C. distance between then decreases
- D. they are adjacent with no space in between
Explanation
In single-slit diffraction, the positions of minima satisfy a sin θ = mλ, so the angular separation between successive fringes decreases for higher orders. Consequently, the outer diffraction fringes become closer together. The likely wrong choice is a because equally spaced bright fringes are associated more closely with an ideal interference or grating pattern, not single-slit diffraction.
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About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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