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A combination is made of two lenses of f...

A combination is made of two lenses of focal lengths f and f' and dispersive power `omega` and `omega'` respectively, The combination is achromatic when

A

`omega'=omega_0, ``omega'` =2 `omega_0`, f'=2f

B

`omega'`=`omega_0`, `omega'`=`2omega_0`,f'=-2f

C

`omega'`=`omega_0`, `omega'`=`2omega_0`,`f'=f//2`

D

`omega'`=`omega_0`, `omega`=`2omega_0`,`f'=-f//2`.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
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  2. A converging achromat lens is to be made by placeing two lenese in con...

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  3. A combination is made of two lenses of focal lengths f and f' and disp...

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  4. When we see an object,the image formed on the retina is

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  5. The focal length of the normal eye-lens is approximaterly

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  6. The distances of the human eye-lens from the retina is x.For a normal ...

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  7. Why is a normal eye not able to see clearly the objects placed closer ...

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  8. When we view objects lying at differnt distances from the eye,which fo...

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  9. Draw a ray diagram to show the image formation by a simple microscope....

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  10. If the least distance of distinct vision is 25 cm,then a convex lens o...

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  11. The convex lenses of focal lengths 0.3 m and 0.05 m are used to make a...

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  12. An observer looks at a tree of height 15 m with a telescope of magnify...

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  13. Magnifying power of a telescope is m.If the focal length of the eye-pi...

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  14. A fly is sitting on the objective of a telescope pointed to the moon.W...

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  15. A telescpe is focussed on the moon.If a tiny drop of ink falls on its ...

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  16. For observing a cricket match,binocular is prefferred to tererestrial ...

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  17. A reflecting telescope utilizes

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  18. The resolving power of a telescope depends upon

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  19. Large aperture telescopes are used for

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  20. Light has the following wave property:

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