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# Prism and Dispersion by a Prism Class 12 Notes | EduRev

## Class 12 : Prism and Dispersion by a Prism Class 12 Notes | EduRev

The document Prism and Dispersion by a Prism Class 12 Notes | EduRev is a part of the Class 12 Course Physics Class 12.
All you need of Class 12 at this link: Class 12

Prism

Prism is uniform transparent medium bounded between two refracting surfaces, inclined at an angle. Angle of Deviation

The angle subtended between the direction of incident light ray and emergent light fay from a prism is called angle of deviation (δ).

Prism Formula

The refractive index of material of prism Dispersion of Light

The splitting of white light into its constituent colours in the sequence of VIBGYOR, on passing through a prism. is called dispersion of light.

The refractive index μv > μR therefore violet colour deviates most and red colour deviates least. i.e., δv > δR. Angular Dispersion

The angle subtended between the direction of emergent violet and red rays of light from a prism is called angular dispersion.

Angular dispersion

(θ) δv – δR = (μv – μR A

where δv and δR are angle of deviation.

Dispersive Power

W = θ/δY = (μv – μ R) / (μY – 1)

where μY = (μ v + μ R ) / 2, is mean refractive index.

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