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One dioptre is the power of a lens of fa...

One dioptre is the power of a lens of facal length

A

`1 cm`

B

`1 m`

C

`-1 cm`

D

`- 1m`

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The correct Answer is:
B
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PRADEEP-OPTICS-Exercise
  1. In the above question, the ralation remains the same whether (A) ima...

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  2. The focal length of a double convex lens is equal to radius of curvatu...

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  3. One dioptre is the power of a lens of facal length

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  4. Two lenses of focal lengths 20 cm and - 40 cm are held in contact. The...

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  5. Refraction of light is the phenomenon of………. When it…………. .

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  6. The basic cause of refraction is…………in going…………. .

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  7. The sun is visible to us before actual………….and after………. . This is bec...

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  8. Total internal reflection of light is the phenomenon of………..into……..fr...

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  9. For toat internal reflection, light must travel……………to………….. .

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  10. Total internal reflection will occure only when………………in………….medium is…...

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  11. Mirage is accounted for by………….. .

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  12. When reflection occurs from denser to………….., then (mu(2))/(mu(1)) = ……...

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  13. For a double convex lens R(1) is………….. And R(2) is…………… . Therefore, i...

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  14. One dioptre is……………of focal length……… .

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  15. A mark is made on the bottom of beaker and a microscope is focussed on...

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  16. Calculate the speed and wvaelength of light (i) in glass (ii) in air, ...

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  17. The refractive index of diamond is 2.47 and that of glass is 1.51. How...

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  18. A pond of depth 20 cm is half filled with an oil of mu = 1.4 and the o...

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  19. A ray of light is incident at an angle of 60^(@) on one face of a rect...

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  20. In Fig. find the maximum angle i for which light suffers total interna...

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