_________ is a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.
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If the angle of incidence formed on a concave mirror at a point is 30 deg then the angle of reflection will be
Polarizing sunglasses are useful because they are able to
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The ratio of change in velocity of a body to the total time taken by it is its __________________.
In an optical fibre the signal is transmitted
The reflection formed by the plane mirror is ________________.
If the force applied on the object is in the direction of its motion, the speed of the object __________.
The greater the difference in _____________, the faster the air moves.
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