# Physics

1)A beam of light passes from air to ethanol, with index of refracton of 1.36. If the angle of incidence ( 1)is 30.0 d/C, then calculate the angle of refraction, after light passes through ethanol and enters into air.

sin-1((1.0003/1.36)sin30.0
21.6 d/C

2)An ____ lens is used to produce a real image.

convex

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1. wouldn't the light beam upon re-entering air be parallel to the original beam in the air?

concave lenses form virtual images. They are often called diverging lenses, because they spread light apart.
http://en.wikipedia.org/wiki/Virtual_image

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