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7. A ray of light is incident from air onto a thin layer of glass (n = 1.5) floating on water (n = 1.33) and is refracted into the glass. Some of the light will reflect at the boundary with water and be refracted back into the air. (For reflection, ?incident = ?reflected.) Calculate the distance this light travels through the glass. Assume the glass has a thickness of 0.5 mm and the original light is incident at 20° from the normal. [10 pts] Hint - draw a picture!

          7. A ray of light is incident from air onto a thin layer of glass (n = 1.5) floating on water (n = 1.33) and is refracted into the glass. Some of the light will reflect at the boundary with water and be refracted back into the air. (For reflection, ?incident = ?reflected.) Calculate the distance this light travels through the glass. Assume the glass has a thickness of 0.5 mm and the original light is incident at 20° from the normal. [10 pts]
Hint - draw a picture!

$7. A ray of light is incident from air onto a thin layer of glass (n = 1.5) floating on water (n = 1.33) and is refracted into the glass. Some of the light will reflect at the boundary with water and be refracted back into the air. (For reflection, ?incident = ?reflected.) Calculate the distance this light travels through the glass. Assume the glass has a thickness of 0.5 mm and the original light is incident at 20° from the normal. [10 pts] Hint - draw a picture!$

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