Question 21
Is the position of a star as seen by us its true position? Justify your answer.

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Solution

No, light from stars undergoes atmospheric refraction and get deviated from actual path. Moreover the atmosphere is a medium of gradually changing refractive index. So, the position of the star seen by us is not its true position but its apparent position after refraction.

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Question 3
The product of three consecutive positive integers is divisible by 6: Is this statement true or false? Justify your answer.

(c o s^{2} 23^{\circ} - s i n^{2} 67^{\circ})

The product of three consecutive positive integers is divisible by $6$ . Is this statement true or false? Justify your answer.

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