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A microscope is focussed ona mark on a p...

A microscope is focussed ona mark on a piece of paper then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark.How should the microscope be moved to get the mark in focus again?

A

2 cm upward

B

45 cm downward

C

1 cm upward

D

1 cm downward.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
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  9. Focal length of a convex lens of refractive index 1.5 is 2 cm.Focal le...

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  10. A convex lens is dipped in a liquid,whose refrctive index is equal to ...

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  11. A lens is placed between a souce of light and a wall.It forms images o...

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  13. A bulb is located on a wll.Its image of equal size is to be obtained o...

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  14. A luminous object is placed at a distance of 30 cm from the convex len...

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  15. A lens having focal length f and aperture of diameter d//2 in the cent...

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  16. A plano-convex lens is made of a material of refrative index mu=1.5.Th...

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  17. The radius of curvatrure of a thin plano-convex lens is 10 cm (of cur...

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  18. A convex lens is dipped in a liquid,whose refrctive index is equal to ...

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  19. If a convex lens of focal length 80 cm and a concave lens of focal len...

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  20. A convex lens and a concave lens ,each having same focal length of 25 ...

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