What is the critical angle for light traveling inside the rod? ?

You need to use snell’s law in this problem.  N1sin (theta) = n2sim (theta)

N1 = index of oil

N2 = index of glass

If you already have the numbers, include it in this equation:

N1.sin (90deg) = N2.sin (critical angle) (note sine (90deg) = 1)

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

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