please answer these in a detailed way. which i can understand. [1] does light travel faster or slower in water than in air? why is this? [2] write down the three effects of refraction.  [3] what is energy? how many types of energy are there? [4] what is the difference between concave and convex lens? [5] write down three ways of refraction. [6] name the colors in the spectrum of the white light. again: please detail these a bit, not fully, but please detail them in a way i can understand, thank you very much.

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