A grating has 500 lines per mm. Its grating element is:
Correct answer: C. 2×10^−6 m
- A. 2×10^−2 m
- B. 2×10^−2 cm
- C. 2×10^−6 m
- D. 2×10^−6 cm
Explanation
The correct option is C because Grating element refers to the distance between two successive slits or lines in a diffraction grating. Given that the grating has 500 lines per mm, which is equivalent to 500,000 lines per meter, the grating element is the reciprocal of this value, which is 2×10^−6 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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