The condition for constructive interference in case of diffraction grating is:
Correct answer: C. d sin θ = mλ
- A. sin θ= dm λ
- B. 2d sin θ = mλ
- C. d sin θ = mλ
- D. d sin θ = 2mλ
Explanation
Grating maxima occur when the path difference between adjacent slits is mλ: d sinθ = mλ (m integer), giving constructive interference at angle θ for order m.
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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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