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Name the following: (a) The opaque mus...

Name the following:
(a) The opaque muscular structure in front of the eye lens that controls the amount of light that enters the eye.
(b) A type of tactual aid that uses patterns of dots embossed on sheets to help people read.

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(a) Iris (b) Braille system
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Which of the following controls the amount of light entering the eye ?

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Give the scientific names of the following parts of the eye : (a) carries signals from an eye to the brain. (b) muscles which change the shape of the eye-lens. (c) a hole in the middle of the iris. (d) a clear window at the front of the eye. (e) changes shape of focus a picture on the retina.

PEARSON IIT JEE FOUNDATION-LIGHT-SOLVED EXAMPLE
  1. Give two uses of periscopes.

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  2. Explain the phenomenon of multiple reflection in brief.

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  3. How many images are formed when two plane mirrors are placed parallel...

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  4. Explain why you can see the back of your head at the hairdresser's sho...

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  5. Why do salons have parallel mirrors?

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  6. Why our pupils contract when a doctor shines a torch in our eyes durin...

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  7. Why does pupil always appear black?

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  8. Discuss the function of iris.

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  9. Give two functions of eyelashes.

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  10. What is vitreous fluid?

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  11. Under what condition, an image formed on this part of the retina canno...

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  12. Explain how our eyes can detect both nearby and faraway objects.

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  13. What do you understand by persistence of image?

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  14. Give any one example of electronic aids available for the visually cha...

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  15. How many dot patterns is the Braille system composed of?

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  16. Name the region where the retina meets the optic nerve and does not co...

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  17. Name the pair of muscles that hold the eye lens at its position and ad...

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  18. Name the following: (a) The opaque muscular structure in front of th...

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  19. What happens when a person is suffering from myopia?

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  20. What do you mean by least distance of distinct vision?

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