(a) Compare the speeds of light of wavelength 4000 Angstrom (i.e. violet light) and 8000 Angstrom (i.e. red light) in vacuum.

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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.

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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