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The velocities of light in two different...

The velocities of light in two different media are 2*`10^8`m/s and 2.5 * `10^8`m/s respectively.The critical angle for these media is sin^(-1)((1)/(5)) sin^(-1)((4)/(5))

A

`sin^(-1)(1/5)`

B

`sin^(-1)(4/5)`

C

`sin^(-1)(1/2)`

D

`sin^(-1)(2/3)`

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The correct Answer is:
B
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AAKASH INSTITUTE-RAY OPTICS AND OPTICAL INSTRUMENTS-EXERCISE
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  2. A glass slab of thickness 4 cm contains the same number of waves as 5 ...

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  3. The velocities of light in two different media are 2*10^8m/s and 2.5 *...

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  4. Light takes t(1) second to travel a distance x cm in vacuum and the sa...

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  5. A fish is a little away below the surface of a lake. If the critical a...

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  6. A parallel beam of monochromatic light falls on a combination of a con...

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  7. The magnifications produced by a convex lens for two different positio...

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  8. Three lenses in contact have a combined focal length of 12 cm. When th...

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  9. The radii of curvatures of a convex lens are 0.04 m and 0.04m. Its ref...

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  10. A convex glass lens (mu(g) = 1.5) has a focal length of 8 cm when plac...

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  11. A convex mirror forms an image one-fourth the size of the object. If o...

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  12. A travelling microscope is focussed on to a scratch on the bottom of a...

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  13. While a moving picture is being screened, a boy introduced a glass sla...

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  14. For a plano convex lens, the radius of curvature of convex surface is ...

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  15. A lens made of material of Refractive index mu(2) is surrounded by a m...

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

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

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

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  19. A prism of refractive index sqrt(2) has a prism angle of 60^(@). At wh...

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

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