A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to
Correct answer: C. 2 x 10^(-6) m
- A. 500 mm
- B. 5 x 10^(-3) mm
- C. 2 x 10^(-6) m
- D. 21 x 10^(-3) mm
Explanation
Slit spacing d = 1 / (lines per unit length) = 1 / (500 per mm) = 2×10⁻³ mm = 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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