# Grade 11 Physics - Light Unit

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Why must rays be shone in the centre of a flat surface? Describe the difficulty that's results if this is not done.

• Grade 11 Physics - Light Unit -

Your question must be in some specific context you did not share. Rays can be shown on any surface, curved, or flat, in the center or not.

• Grade 11 Physics - Light Unit -

We did an experiment of Snell's law of refraction and we shined a light through the centre of semicircular prism on a flat surface to measure the angle of refraction. That was one of our questions I didn't understand necessarily why.

• Grade 11 Physics - Light Unit -

In an experiment like that, the light beam (which I assume was a narrow laser beam) must strike midway between the edges of semicircular prism, so that it is refracted along a radius of the semicircle and strikes the semicircular surface at a right angle. In that matter, it is not refracted a second time, so the angle of refraction at the flat surface can easily be measured.

• Grade 11 Physics - Light Unit -

The word "matter" in my answer above should be "manner"

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