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A travelling microscope is focussed on t...

A travelling microscope is focussed on to a scratch on the bottom of a beaker. Water of refractive index `(4)/(3)` is poured in it. Then the microscope is to be lifted through 2 cm focus it again. Find the depth of water in the beaker.

A

4 cm

B

8 cm

C

`8/7` cm

D

`8/3` cm

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The correct Answer is:
B
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AAKASH INSTITUTE-RAY OPTICS AND OPTICAL INSTRUMENTS-EXERCISE
  1. A convex glass lens (mu(g) = 1.5) has a focal length of 8 cm when plac...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  18. The eye defect, Astigmatism can be corrected by using , -

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  19. The magnifying power of simple microscope is

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  20. Lateral magnification of objective of compound microscope is 100 and a...

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