What is wavelength of visible spectrum?
Correct answer: C. 3900 - 7600 angstrom
- A. 8500 - 9800 angstrom
- B. 7800 - 8000 angstrom
- C. 3900 - 7600 angstrom
- D. 1300 - 3000 angstrom
Explanation
Visible light has wavelengths of approximately 3900 to 7600 Å, or 390 to 760 nm. The likely mistake is 7800 to 8000 Å, which lies mainly in the infrared region beyond the usual visible range.
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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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