Prism and Dispersion by a Prism Class 12 Notes | EduRev

Physics Class 12

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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.

Prism and Dispersion by a Prism Class 12 Notes | EduRev

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

Prism and Dispersion by a Prism Class 12 Notes | EduRev

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.

Prism and Dispersion by a Prism Class 12 Notes | EduRev

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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