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Is focal length of eye lens fixed? If no...

Is focal length of eye lens fixed? If not, why?

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(a) Can you measure rough focal length of a convex lens? If yes, why? (b) Can you measure rough focal length of a concave lens ? If not, why not?

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MBD -HARYANA BOARD-LIGHT-EXAMPLE
  1. Name the seven colours of light. What is this phenomenon called?

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  2. Give one example of dispersion of light in nature.

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  3. Is focal length of eye lens fixed? If not, why?

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  4. What is the function of ciliary muscles in human eye? What ability do ...

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  5. What is the function of rod cells on the retina? Which cells detect co...

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  6. What are cones? What problem occurs if they don't work properly?

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  7. What is basic cause of colour blindness?

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  8. Why cats and bats are able to see at night?

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  9. At what rate the images pass one after the other on a cinema screen?

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  10. What is retina? What type of photosensitive cells are present on the r...

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  11. Name one device that can be used by short statured person to see over ...

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  12. Find out the letters of English alphabet or any other language known t...

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  13. Distinguish between luminous and non-luminous bodies.

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  14. How do we see objects?

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  15. Give the conditions necessary for seeing an object.

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  16. What is the virtual image ? Give one situation where a virtual image i...

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  17. What do you understand by lateral inversion?

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  18. State the laws of reflection of light.

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  19. What is diffused reflection and regular reflection? Give examples.

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  20. What do you understand by reflection of light?

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