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A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length 6.0cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?

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24, 150 cm
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NCERT BANGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-EXERCISES
  1. A compound microscope consists of an objective lens of focal length 2....

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  2. A person with a normal near point (25 cm) using a compound microscope ...

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  3. A small telescope has an objective lens of focal length 144cm and an e...

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  4. (a) A giant refracting telescope at an observatory has an objective le...

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  5. Use the mirror equation to deduce that: (a) an object placed between...

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  8. Answer the following questions: (a) You have learnt that plane and c...

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  9. Answer the following questions: (b) A virtual image, we always say, ...

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  10. Answer the following questions: (c) A diver under water, looks obliq...

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  11. Answer the following questions: (d) Does the apparent depth of a tan...

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  12. Answer the following questions: (e) The refractive index of diamond ...

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  13. The image of a small electric bulb fixed on the wall of a room is to b...

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  14. (a) Determine the 'effective focal length' of the combination of the t...

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  15. At what angle should a ray of light be incident on the face of a prism...

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  16. A card sheet divided into squares each of size 1 mm^(2) is being viewe...

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  17. (a) At what distance should the lens be held from the figure in Exerci...

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  18. What should be the distance between the object in Exercise 9.24 and th...

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  19. Answer the following questions: (a) The angle subtended at the eye b...

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  20. Answer the following questions: (b) In viewing through a magnifying ...

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