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A glass if filled with water up to 12.5 cm. The apparent depth of an needle lying at the bottom of the tank is measured by microscope to be 9.3 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.6 up to the same height, by what distance would the microscope have to be moved to focus on the needle again?

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The correct Answer is:
1.33; 7.47cm
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CHHAYA PUBLICATION-REFRACTION OF LIGHT-Problem set - II
  1. The length of the side of a transparent cube is 18 cm . Inside the cub...

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  2. A tank's depth is 2d and the apparent depth of the liquid in the tank ...

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  3. A ray of light is incident on a transparent block of refractive index ...

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  4. The height of a vessel is 15 cm . Liquid is poured into the vessel suc...

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  5. The length of a fish is 12 cm. The fish is advancing forward to the fr...

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  6. There is a mark at the base of an empty beaker. The mark is focussed w...

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  7. A hemisphere of radius 4 cm is placed centrally on cross mark. When i...

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  8. A rectangular block of thickness 10 cm and refractive index 1.5 is pla...

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  9. A microscope is focussed on a point at the base of an empty vessel. No...

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  10. A part of straight stick is immersed in water in an inclined way. When...

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  11. A glass is filled with water up to 12.5 cm. The apparent depth of an o...

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  12. A glass if filled with water up to 12.5 cm. The apparent depth of an n...

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  13. A small electric lamp is placed at a depth of 46 cm inside a tank full...

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  14. A luminous point source is placed at a depth of 30 cm in a source cont...

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  15. A source of light is placed at the bottom of a tank filled with water ...

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  16. wavelength of light in a medium is 4000 Å and that in another medium i...

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  17. Light ray passes through an equilateral prism (mu = 1.5) such that the...

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