Question

A ray of light passing through a point situated on the principal axis of a lens goes straight without suffering any deviation. The point is called the​

Answer 1

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Answer 2

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. ... The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation.