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A microsocpe has a convex lens of a sho...

A _________ microsocpe has a convex lens of a short focal length.

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Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power ?

The power of a convex lens of focal length 50 cm is …………….

A concave lens is kept in contact with a convex lens of focal length 20 cm. The combination behaves as a convex lens of focal length 50 cm . Find the power of concave lens.

An object of length 2.0 cm is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. Find the size of the image of the object is at a distance of 8.0 cm from the lens.

An object is placed at a certain distance from a convex lens of focal length 20 cm. Find the distance of the object if the image obtained is. magnified 4 times.

The power of convex lens with focal length 40 cm is …………

A convex lens of 40 cm focal length is combined with a concave lens of focal length 25 cm. The power of combination is

SURA PUBLICATION-OPTICS-ADDITIONAL QUESTIONS & ANSWER (Fill in the blanks (Covers whole unit))
  1. Cylindrical lenses are also called as lenses.

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  2. Both the defects of vision-myopia as well as hypermetropia can be corr...

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  3. A microsocpe has a convex lens of a short focal length.

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  4. Magnification power of microscope has to times more magnification po...

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  5. Compound microscope has to times more magnification power than simpl...

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  6. A microscope is used to measure very small length with high degree of...

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  7. The least count of a travelling microscope is

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  8. is an optical instrument used to see distant objects.

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  9. The first telescope was invented by in 1608.

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  10. made a telescope to observe distant stars.

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  11. The invented telescope was similar to the astronomical telescope.

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  12. A microscope works based on the principle of vernier.

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  13. The minimum distance required to see the objects distinctly without st...

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  14. is know as long sightedness.

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  15. Aged person cannot see the nearby objects . It is called .

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  16. mirrors are used in relfecting telescope.

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  17. Galilean telescope, Keplerian telescope are some of the example of te...

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  18. The ratio of speed of light in vaccum to the speed of light medium is ...

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  19. The energy of incident and scattered beam of light are not same, that ...

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  20. Mie scattering is caused by , and .

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