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An observer can see through a pin-hole t...

An observer can see through a pin-hole the top end of a thin rod of height h, placed as shown in the figure. The height of beaker is 3h and its radius is h. When the beaker is filled with a liquid up to a height 2h, he can see the lower end of the rod. Then the refractive index of the liquid is
.

A

`5//2`

B

`sqrt(5//2)`

C

`sqrt(3//2)`

D

`3//2`.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. A ray of light travelling in water is incident on its surface open to ...

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  2. A rectangular glass slab ABCD of refractive index n1 is immersed in wa...

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  3. An observer can see through a pin-hole the top end of a thin rod of he...

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  4. Two beams of red and violet colours re mde to pass separaterly through...

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  5. A ray OP of monochromatic light is incident on the face AB of prism AB...

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  6. Which of the following forms (s) a virtual and erect image fo all posi...

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  7. A spherical surface radius of curvatue R seprates air (refractive inde...

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  8. A point object is placed at the centre of a glass sphere of radius 6 c...

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  9. The graph between object distance u and image distance v for a lens is...

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  10. A convex lens A of focal length 20 cm and a concave lens B of focal le...

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  11. The size of the image of an object,which is at infinity, as formed by ...

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  12. A convergeing lens is used to form an image on a screen.When the upper...

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  13. A point object is placed at a distance of 20 cmA point object is place...

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  14. A biconvex lens of focal length 15 cm is in front of a plane mirror.Th...

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  15. A concave lens of glass, refractive index 1.5 ,has both surfaces of th...

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  16. A double convex lens made from a material of refractive index mu1 is i...

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  17. A convex lens is in contact with concave lens .The magnitude of the ra...

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  18. A hollow doublew concave lens is made of very thin transparent materia...

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  19. A biconvex of focal length forms a circular image of radius r of sun ...

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  20. A real image of a distant object is formed by a plano-convex lens on i...

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