# capa13 - Solution Derivations for Capa #13 1) A super nova...

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Where the last step follows since the ray is emerging into air. Now, we can ﬁnd the length of the triangle which will be the radius of the largest circle of which light can still emerge. Thus, φ = 90 - θ c tan φ = d r r = d tan φ = d tan (90 - θ c ) The area of a circle is A = πr 2 = π ± d tan (90 - θ c ) ! 2 3) A laser beam enters a 14 . 0 cm thick glass window at an angle of 46 (from the normal). The index of refraction of the glass is 1 . 50. At what angle from the normal does the beam travel through the glass? Use units of “deg.” w = Given (width) θ 1 = Given n 2 = Given n 1 = Given (air) Thus, using Snell’s Law, n 1 sin θ 1 = n 2 sin θ 2 θ 2 = sin - 1 ² n 1 n 2 sin θ 1 ³ = sin - 1 ² 1 n 2 sin θ 1 ³ 2
4) How long does it take the beam to pass through the plate? This one is a bit trickier since the ray does not travel straight through the glass.

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## This homework help was uploaded on 04/03/2008 for the course PHYS 1120 taught by Professor Rogers during the Fall '08 term at Colorado.

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capa13 - Solution Derivations for Capa #13 1) A super nova...

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