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For a double convex lens R(1) is………….. A...

For a double convex lens `R_(1)` is………….. And `R_(2)` is…………… . Therefore, its focal length is………… .

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positive , negative , positive.
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PRADEEP-OPTICS-Exercise
  1. Mirage is accounted for by………….. .

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

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

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

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

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

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

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

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

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

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  11. Calculate the critical angle for glass air surface if a ray of light w...

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  12. A small bulb (assumed to be a point source) is placed at the bottom of...

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  13. The refractive indices of glycerine and water are 1.46 and 1.33 repect...

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  14. A point source of monochromatic light 'S' is kept at the centre of the...

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  15. When a fish looks up the surface of a perfectly smooth lake, the surfa...

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  16. A right prism is to be made by selecting a proper material and the ang...

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  17. In Fig. 6(b).80, light rays of blue, green and red wavelength are inci...

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  18. Calculate the speed of light in a medium whose critical angle is 45^(@...

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  19. Velocity of light in a liquid is 1.5 xx 10^(8) m//s and in air, it is ...

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  20. An air bubble in sphere having 4cm diameter appears of 1 cm from surfa...

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