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(a) Compare the speeds of light of wavelength 4000 Angstrom  (i.e. violet light) and 8000 Angstrom (i.e. red light) in vacuum.
(a) Compare the speeds of light of wavelength 4000 Angstrom  (i.e. violet light) and 8000 Angstrom (i.e. red light) in vacuum.
Class 10 | ICSE | Physics | Refraction of Light at Plane Surfaces | Selina
(a) Compare the speeds of light of wavelength 4000 Angstrom  (i.e. violet light) and 8000 Angstrom (i.e. red light) in vacuum.

Solution:

(a) Because the speed of light is determined by the medium rather than the wavelength, the speed will be the same for both.

(b) Because a denser medium has a greater refractive index, the speed of light in that medium is slower than the speed of light in a medium with a lower refractive index.

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