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State two drawbacks of astronomical tele...

State two drawbacks of astronomical telescope.

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BINA LIBRARY-Optics-I-EXERCISE
  1. Draw a labelled ray diagram to show the image formation in an astronom...

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  2. Write down the expression for astronomical magnifying power.

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  3. State two drawbacks of astronomical telescope.

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  4. Draw a labelled ray diagram to show the image formation in a reflectin...

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  5. Write two advantages of a reflecting telescope over a refracting teles...

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  6. Modern telescope prefer using mirrors over using suitable lenses. Give...

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  7. Concave mirrors are used as shaving mirrors. Why?

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  8. Give reasons why convex mirrors are generally used as driving mirrors.

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  9. How will you distinguish between plane, concave and convex mirrors?

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  10. If a concave mirror is held in water, will its focal length change as ...

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  11. Bubbles of air coming out through water in glass vessel appears silver...

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  12. Name a mirror that can give an erect and enlarged image of an object.

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  13. Does the focal length of a lens depends on the medium in which it is i...

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  14. Is it possible for a given lens to act as a converging lens in one med...

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  15. Why goggles(sun glasses) have zero power even though their surfaces ar...

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  16. Does the focal length of a lens change if instead of blue light, monoc...

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  17. A thin converging lens has a focal length 'f in air. If it is complete...

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  18. Explain why rainbow is never seen on the surface of the moon.

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  19. Explain why is the sun visible a little before actual sunrise and a li...

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  20. Explain the origin of the blue colour of sky.

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