Physics, asked by alkapathak26, 1 year ago

can anyone give notes of chapter spectrum in physics class 10

Answers

Answered by cutipie95
1
Deviation:

When a light ray enters one refracting surface of the prism, it bends towards the normal and when it emerges out of the other refracting surface it bends away from the normal. The angle between the incident ray and the emergent ray is the angle of deviation.

Dispersion:

The phenomenon due to which a polychromatic light, like sunlight, splits into its component colours, when passed through a transparent medium like a glass prism, is called dispersion of light.

Spectrum:

The band of colours obtained on the screen, when a polychromatic light splits into component colours is called a spectrum. 

Deviation produced by a triangular prism

This phenomenon can be observed in a lab environment using a triangular glass prism.

A prism is a solid structure having three rectangular and two triangular surfaces. Any two rectangular faces are the refracting surfaces and the third one is the base. The angle between the refracting surfaces is the angle of the prism or refracting angle. The edge formed by the two refracting surfaces is the refracting edge as shown in the diagram.

When a light ray enters one refracting surface of the prism, it bends towards the normal and when it emerges out of the other refracting surface it bends away from the normal. The angle between the incident ray and the emergent ray is the angle of deviation.

\ce∠\ce∠i + \ce∠\ce∠e = \ce∠\ce∠A + \ce∠\ce∠d 
 

A is the angle of the prism 
d is the angle of deviation

The total angle of deviation δ depends on,

The angle of incidence at the first surface (i).

The angle of the prism (A).

The refractive index of the material of the prism





Dependence of deviation on colour of light

The refractive index of the material of prism increases with the decrease in the wavelength of light.Hence, the deviation caused by the prism also increases with the decrease in the wavelength of light.

In visible light, violet (wavelength = 4000 Å) is deviated the most & red (wavelength \ceλ\ceλ = 8000 Å) is deviated the least



 Hope  it's  helpful

alkapathak26: thank for ur help
Answered by Anonymous
0
Deviation:

When a light ray enters one refracting surface of the prism, it bends towards the normal and when it emerges out of the other refracting surface it bends away from the normal. The angle between the incident ray and the emergent ray is the angle of deviation.

Dispersion:

The phenomenon due to which a polychromatic light, like sunlight, splits into its component colours, when passed through a transparent medium like a glass prism, is called dispersion of light.

Spectrum:

The band of colours obtained on the screen, when a polychromatic light splits into component colours is called a spectrum. 

Deviation produced by a triangular prism

This phenomenon can be observed in a lab environment using a triangular glass prism.

A prism is a solid structure having three rectangular and two triangular surfaces. Any two rectangular faces are the refracting surfaces and the third one is the base. The angle between the refracting surfaces is the angle of the prism or refracting angle. The edge formed by the two refracting surfaces is the refracting edge as shown in the diagram.

When a light ray enters one refracting surface of the prism, it bends towards the normal and when it emerges out of the other refracting surface it bends away from the normal. The angle between the incident ray and the emergent ray is the angle of deviation.

∠∠i + ∠∠e = ∠∠A + ∠∠d 
 

A is the angle of the prism 
d is the angle of deviation

The total angle of deviation δ depends on,

The angle of incidence at the first surface (i).The angle of the prism (A).The refractive index of the material of the prism
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