What is the ray of light?
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Which element has the simplest absorption spectrum?
Why is it possible to see the face through a glass, ehen it is polished from on side ?
When thomas edison was promoting the wide use of direct current, this personal enemy of edisons was the chief proponent and expert in alternating current?
All elements with an atomic number greater than what number are unstable?
What is Suspension ?
Why does a water pump becomes ineffective, when water ha to be raised through a height grater than 30 ft. ?
Why it is more difficult to stop a cricket ball than a tennis ball moving with same velocity ?
Which lens is used for correcting short ?sightedness ?
What is Soda lime ?
What are wave fronts?
Which properties of waves are independent of each other?
the magnifying power of a simple microscope can be increased if we use eye piece of