Light of wavelength 450 nm is incident on a diffraction grating on which 5000 lines/cm have been ruled. How many orders of spectra can be observed on either side of the direct beam?
Correct answer: D. 4
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
The explanation is given below:Wavelength of light, λ = 450 nm = 4.5×10^-5cmNumber of lines per cm, N = 5000Required:The orders of spectra that can be observed, n=?Solution:n = 1/λNn=1/4.5× 10^-5 cm × 5000n = 4.44 ~ 4
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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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