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A beam of parallel rays of width b cm pr...

A beam of parallel rays of width b cm propagates in glass at an angle `theta` to its plane face. What would the beam width `b_(1)` be after it goes over to air thrugh this face? (The refractive index of the glass is `mu`)

A

`b mu`

B

`b mu cos theta `

C

`(b(1 - mu^2 cos^2 theta)^(1//2))/(sin theta)`

D

`(b(1-mu^2 sin^2 theta)^(1//2))/(cos theta)`

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-GEOMETRICAL OPTICS-ADDITIONAL PRACTICE EXERCISE (LEVEL-II LECTURE SHEET(ADVANCED) STRAIGHT OBJECTIVE TYPE QUESTIONS)
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  7. A ring of radius 1cm is placed 1m in front of a spherical glass ball...

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  11. A convex lens is placed some where between an object and a screen whic...

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  12. A point object moves along the principal axis of a convex lens of foca...

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  14. A converging lens L(1) of focal length 20 cm is separated by 8 cm from...

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  15. A point object is placed at a distance of 20 cm from a thin plano-conc...

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  16. Figure shows an arrangement ofan equiconvex lens (f=20 cm in air) and ...

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  17. A point object O is placed at a distance of 0.3m from a convex lens (f...

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  18. A small object stuck on the surface of a glass sphere (n=1.5) is viewe...

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  19. A plano-convex lens has thickness 4cm. When places on a horizontal tab...

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