A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________?
Correct answer: D. 2 x 10^-3 mm
- A. 500 mm
- B. 5 x 10^-3 mm
- C. 2 x 10^-5 mm
- D. 2 x 10^-3 mm
Explanation
The grating element is the spacing between adjacent lines: d = 1/(500 lines mm-1) = 0.002 mm = 2 x 10^-3 mm. The likely wrong choice is c, 2 x 10^-5 mm, which results from an incorrect reciprocal or unit conversion.
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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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