(a) A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.; (b) Why do stars twinkle? Explain.; OR; (a) Write the function of each of the following parts of human eye:; (i) Cornea (ii) Iris (iii) Crystalline lens (iv) Ciliary muscles; (b) Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an astronaut on the Moon? Give reason to justify your answer.(All India - 2018)
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by lakshya singh....
read carefully and if any problem then coment down....
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Explanation:
(a)The student is unable to see blackboard clearly from distance as he is suffering from myopia .
The cause of defect can be :
Accommodation problem
Eye ball being too large
Converging power of lens being too high
Due to this the defective image is formed that is in front of retina .
Correction
It can be corrected by using concave lens in spectacles .
There is an option therefore first part (a) is solved .
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