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The length of a telescope is 36 cm . The...

The length of a telescope is 36 cm . The focal lengths of its lenses can be

A

`30 cm, 6 cm `

B

`-30 cm - 6 cm `

C

`30 cm -6 cm `

D

`-30 cm 6 cm`

Text Solution

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The correct Answer is:
A
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MOTION-RAY OPTICS-Exercise-1
  1. In the figure shown, there are two convex lenses L(1) and L(2) having ...

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  2. What should be the value of distance d so that final image is formed o...

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  3. If the central portion of a convex lens is wrapped in black paper as s...

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  4. Focal length of a convex lens will be maximum for

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  5. A convex lens form a real image of a point object placed on its princi...

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  6. Shift on the principal axis

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  7. When the length of a microscope tube increases, its magnifying power

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  8. In a simple microscope, if the final image is located at infinity then...

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  9. In a simple microscope, if the final image is located at infinity then...

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  10. In astronomical telescope, the final image is formed at

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

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  12. An astronomical telescope has a magnifying power 10. The focal length ...

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  13. The magnifying power of an astronomical telescope can be increased, if...

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  14. If F(0) andF(e) are the focal lengths of the objective and eye-piece r...

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  15. A microscope is focused on a mark on a piece of paper and then a slab ...

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  16. An astronomical telescope of magnifying power 8 is made using two lens...

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  17. The magnifying power of the objective of a compound microscope is 7 if...

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  18. A telescope consisting of an objective of focal length 60 cm and a sin...

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  19. An equiconvex lens has a power of 5 dioptre. If it is made of glass of...

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  20. The length of a telescope is 36 cm . The focal lengths of its lenses c...

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