____9. There are seven members of electromagnetic radiation family. ____10. EM waves are composed of oscillating magnetic and electric fields. ____11. When light moves from one medium to another, it normally diffract. ____12. The angle of incidence θi is equal to the angle of reflection θr according to Snell’s Law.

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Dispersion of White Light

Snell’s law is a formula that gives a relation between the angle of incidence and angle of refraction and is given as: