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If fv and fr are the focal lengths of a ...

If `f_v` and `f_r` are the focal lengths of a convex lens fro violet and red light respectively and `F_v` and `F_r` are the respective focal length of a concave lens,then we must have

A

`f_vgtf_r` adn `F_vltF_r`

B

`f_vltf_` and `F_vltF_r`

C

`f_vgtf_r` and `F_vgtF_r`

D

`f_vltf_r` and `F_vgtF_r`.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
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  2. The focal length of a coverging lens is measured for violet,green and ...

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  3. If fv and fr are the focal lengths of a convex lens fro violet and red...

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  4. Rainbow is formed due to combination fo

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  5. For relaxed eye,magnifying power of a microscope is

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  6. An astronomical telescope of ten fold angular magnification has a leng...

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  7. Which one off the following phenomena is not explained by Huygens' con...

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  8. Ratio of intensity of two waves is given by 4:1. Then, ratio of the am...

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  9. How is interference pattern in double slit exp[eriment affected,if a s...

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  10. Interference was observed in interference chamber,when air was present...

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  11. In Young's double silt experiment, the fringe width obtained is 3 mm i...

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  12. In a Young's experiment,two coherent sources are placed 0.9 mm apart a...

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  13. In a Fresnel biprism experiment,the two positions of lens give separat...

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  16. A telescope has an objective lens of 10 cm diameter and is situated at...

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  17. Diameter of human eye lens is 2 mm.What will be the minimum distance b...

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  18. Which one of the following statement is true?

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  19. A ray of light from a rarer medium strikes a denser medium. The reflec...

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  20. Velocity of light in a liquid is 1.5 xx 10^8 ms^(-1) and in air,it is ...

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