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# Prism

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### Prism

1. 1. Transparent Glass PrismLIGHT
2. 2. Prism and refraction n ectio l d ir tia A Ini N δm N Emer ging ray ra y id ent PrismInc A is the angle of prism N is normal on the surface of prism δm is the deviation of emerging ray from initial direction
3. 3. Dispersion of white light of sun by prism Spectrum A Red 6600 Å Orange 6100 Å ig ht Yellow 5800 Å wh it el prism Green 5500 Å Blue 4700 Å Indigo 4400 Å Violet 4100 Å wavelength λ of the center of color band in angstromsIf a shaft of light entering a prism is sufficiently small suchthat the coloured edges meet, a spectrum results
4. 4. An experiment to observe spectrumwhite light Spectrum
5. 5. Deviation by prism Angle of dispersion θ A δm Θ δR δV θ = δV - δR t e ligh Dispersive power ωWhit θ ω= δm δR ⇒ deviation for red δV - δR δV ⇒ deviation for violet ω= δm δm ⇒ mean deviation or deviation for yellow
6. 6. Deviation by prism Angle of dispersion θ A δm Θ δR δV θ = δV - δR t e ligh Dispersive power ωWhit θ ω= δm δR ⇒ deviation for red δV - δR δV ⇒ deviation for violet ω= δm δm ⇒ mean deviation or deviation for yellow