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If a concave mirror is held in water, wi...

If a concave mirror is held in water, will its focal length change as compared to its value in air?

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BINA LIBRARY-Optics-I-EXERCISE
  1. Give reasons why convex mirrors are generally used as driving mirrors.

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

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

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

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

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

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

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

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

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

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

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

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

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  14. Explain why the setting sun looks red?

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  15. Why is red light used as a danger signal ?

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  16. Explain why yellow head-lights are used in cars in foggy weather.

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  17. In order to take colour photograph of a planet, what kind of telescope...

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  18. Why should a simple magnifying glass be placed closer to the eye ?

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  19. What is the best position for eye viewing an object through microscope...

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  20. Define beam of light.

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