light travels in staight lines in air. how does it travel in other transparent materials?

Question

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Answer 1

It'll travel in straight lines too, but when light enters, the angle will be changed. The angle is given by the equation known as Snell's Law:

n1 sin Theta1 = n2 sin Theta2

where n is the index of refraction, given by the equation

n= c/v, where c is the speed of light in a vaccum, and v is the velocity of light in a given material.,

and Theta1 is the angle of incidence, and Theta2 is the angle of refraction, both measured with respect to the normal of the surface.