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Q. The power of a lens is measured in:
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Q. Thermal expansion of materials arises from
Q. Stars appear twinkling as of......... of light.
Q. Which of the following is the correct equivalent of 1 atmosphere?
Q. Eclipses occur due to which optical phenomena -
Q. Compressions and Rarefactions are characteristic of
Q. A common flurescent tube contains
Q. A transformer works on the principle of
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