/sci/ - Science & Math

>>8097066
Use snell's Law. The index of refraction of vacuum is less than the index of refraction of air, so that means the angle in vacuum has to be larger than the the angle in air.

Now look at pic related. The red lines are the rays of light, and the blue lines represent the surface between air and vacuum and the lines normal to the surface. Snell's law applies to the angle between the light ray and line normal to the surface.
For question 7 (box labelled 8 in the picture) notice the angle the light makes with the normal line in air is smaller than it is in vacuum, just as we stated it should be from Snell's law. Now from an observer in space looking at the system (that's us looking at pic related) it appears that the light ray is pointed above the moon. So for number 7 the answer would be C. The same reasoning applies to question 8 (box 9), except it appears that the laser is pointed under the moon.