When light goes from one material into another material having a higher index of refraction, it

Answer

When the light goes from one medium to another medium with higher refractive index the velocity of the ray decreases, wavelength of the ray also decreases.

But the frequency of the ray when it enters the medium of higher refractive index remain same.

So, we can conclude that speed of ray and wavelength decrease but frequency remain unchanged.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

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