Question

what is the cartesian sign convention used for lenses? state with figure.
plzz give me the answer but don't spam . if you don't know so plzz don't give the answer​

Answer 1

Answer:

When we put some acetone or petrol or perfume on our palm, it evaporates. During evaporation, particles of the liquid absorb energy from the surface of the palm to compensate for the loss of energy, making the surroundings cool. The acetone, petrol or perfume take this latent heat of vaporisation from our palm.