CLASS 10 ASSIGNMENT......OF RENU MAM 1. Name two natural phenomena based on the refraction of light. 2. Name two phenomena which occur due to atmospheric refraction. 3. Draw a labelled diagram to show the refraction of light through the prism. 4. Describe dispersion of white light and its spectrum. 5. What do you mean by recombination of light? How can we get white light from a prism? 6. Name the common defects of the human eye. 7. Explain the following diseases. Mention their causes. How can they be corrected? Explain with the help of the labelled diagrams. (i) Myopia (ii) Hypermetropia (iii) Presbyopia 8. What is astigmatism? How can it be corrected? 9. Name the diseases known as old age hypermetropia. What are its causes? How can it be corrected? 10. A person is suffering from hypermetropia. The near point of the person is 1m. Calculate the focal length and the power of the convex lens used in spectacles. Assume that the near point of the normal eye is 25 cm. 11. The far point of a myopic eye is 80 cm in front of the eye. What is the nature and the power of the lens required to enable him to see very distant objects distinctly? 12. Name the type of lens used in human eye. What is it made up of? How does it works?
Posted on: Mon, 02 Dec 2013 13:38:26 +0000
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