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For a given prism thetaanddelta are angu...

For a given prism `thetaanddelta` are angular dispersion and deviation. Correct relation is

A

`thetapropdelta`

B

`thetaprop1/delta`

C

`thetapropdelta^(2)`

D

`thetaalphaprop1/delta^(2)`

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The correct Answer is:
A
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When a ray of sun light passes through the prism, each colour of light has its own speed in the glass. The seven colours come out of the prism with different angles of deviation. Red deviates least and blue deviates maximum. Thus a prism can disperse a white light into seven colours which is called colour spectrum. For a thin prism, the angle of deviation is given as delta=(n-1)A . The angle of dispersion is given as phi=delta_(v)-delta_(r) . The dispersive power of a prism is omega=(phi)/(delta_("mean"))=(phi)/(delta_(y)) Using the above ideas, give answer the following questions. A prism has R.I. for violet and red n_(v)=1.523, n_(r)=1.5145 . If the angle of prism is A=2^(@) the dispersive power of the prism is :

AAKASH INSTITUTE ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-EXERCISE
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  2. A lens made of material of Refractive index mu(2) is surrounded by a m...

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  3. A light ray is incident normally on one of the refracting faces of a p...

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  4. If a light ray incidents normally on one of the faces of the prism of ...

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  5. A ray of light is incident on one of the faces of the angle prism with...

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  6. A prism of refractive index sqrt2 has refractive angle 60^@. In the or...

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  7. The least angle of deviation for a glass prism is equal to its refract...

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  8. A light ray of angles of incidence 40^(@) emerged from the prism in mi...

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  9. The angle of minimum deviation for a 75^(@) prism of dense glass is fo...

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  10. Suppose a small angled prism of 6^(@) deviates a ray through 3^(@), th...

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  11. For a given prism thetaanddelta are angular dispersion and deviation. ...

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  12. If a is the size of scatterer and lamda is the wavelength of light the...

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  13. Which of the following colour is scattered most is atmosphere?

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  17. Advantages of cassegrain telescope is/are

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  18. A simple telescope consisting of an objective of focal length 60 cm an...

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