Why is it that we call something "cool" when it's not really cold?
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Answer:
If you say that a person or their behavior is cool, you mean that they are calm and unemotional, especially in a difficult situation. ... If you say that a person or thing is cool, you mean that they are fashionable and attractive. [informal, approval] He was trying to be really cool
Answer:
A student focused the image of a candle flame on a white screen using a convex lens.He noted down the position of the candle,screen and the lens as under, Position of candle=12.0 cm Position of convex lens=50.0 cm Position of screen=88.0 cm a)What is the focal length of the convex lens? b)Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?