A red light of wavelength 6400A° in air has wavelength 4000A° in glass. If the wavelength of violet light in air is 4400A°, find its wavelength in glass.
(Assume that μr ≈ μv)
(λr)air = 6400A°
(λr)glass = 4000A°
(λv)air = 4400A°
(λr)air/(λr)glass = (λv)air/(λv)glass
∴ (λv)glass = (λv)air × (λr)glass / (λr)air
∴ (λv)glass = 4400 × 4000 / 6400
∴ (λv)glass =2750A°
Concept: Measurement of Wavelength by Biprism Experiment
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