Write a brief explanation about refraction in prism
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When a ray of light passes through a glass prism, refraction (or bending) of light occurs both, when it enters the prism as well as when it leaves the prism. Since the refracting surfaces (PQ and PR) of the prism are not parallel, therefore, the emergent ray and incident ray are not parallel to one other (see Fig.). In this case the ray of light is deviated on passing through the prism.
In figure, a glass prism PQR has been kept on its base QR. A ray of light AB is incident on the face PQ of the prism. The incident ray AB is going from air (rarer medium) to glass (denser medium), so it bends towards the normal BN' and goes along the direction BC inside the prism. Thus BC is the retracted ray of light which bends towards the base QR of the prism.
In figure, a glass prism PQR has been kept on its base QR. A ray of light AB is incident on the face PQ of the prism. The incident ray AB is going from air (rarer medium) to glass (denser medium), so it bends towards the normal BN' and goes along the direction BC inside the prism. Thus BC is the retracted ray of light which bends towards the base QR of the prism.
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REFRACTION of LIGHT in PRISM
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first of all understand what is " PRISM " ?
A " PRISM" is a portion of a refracting medium bounded by two plane faces inclined to each other at a certain angle.
The two plane faces inclined to each other called " REFRRACTING face" . the line along which the two refracting faces meet is called " REFRACTING edge " of the prism .
REFRACTION of light through PRISM
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when a ray of light is refracted through prism , the sum of the angle of incidence i and angle of emergence i' is equal to the sum of angle of the prism A and angle of deviation ( d ),
A + d = i + i' and A = r + r'
where r and r' are the corresponding angles of refraction at two faces.
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first of all understand what is " PRISM " ?
A " PRISM" is a portion of a refracting medium bounded by two plane faces inclined to each other at a certain angle.
The two plane faces inclined to each other called " REFRRACTING face" . the line along which the two refracting faces meet is called " REFRACTING edge " of the prism .
REFRACTION of light through PRISM
======xxxx ========xxxx =========
when a ray of light is refracted through prism , the sum of the angle of incidence i and angle of emergence i' is equal to the sum of angle of the prism A and angle of deviation ( d ),
A + d = i + i' and A = r + r'
where r and r' are the corresponding angles of refraction at two faces.
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