The picture below shows a source of light (the red dot), with the light shining

Question

The picture below shows a source of light (the red dot), with the light shining on the origin, which is marked by the position of the green dot. The horizontal axis is the interface separating one medium from another. Some of the light reflects back into the first medium, and some refracts into the second medium.

Choose the three correct statements about this situation from the list below.

-The first medium (where the source is) has a higher index of refraction than the second medium.

-The first medium has the same index of refraction as the second medium.

-The first medium has a lower index of refraction than the second medium.

-If the index of refraction of the second medium was increased, the angle of the reflected beam would change.

-Changing the index of refraction of the second medium would have no effect on the angle of the reflected beam.

-If the light source was moved to the position of the purple dot in the second medium, and the light was incident on the origin again, the light would definitely experience total internal reflection.

-If the light source was moved to the position of the purple dot in the second medium, and the light was incident on the origin again, some light would refract out into the upper medium, traveling toward the position of the red dot.

-If the light source was moved to the position of the purple dot in the second medium, and the light was incident on the origin again, some light would refract out into the upper medium, but the light would not travel toward the position of the red dot.

Explanation / Answer

1) Flase

2) True

3) False

4) True

5) False

6) True

7) False

in first 4 cases, theta_r > theta_r

so, refraictive index of first medium < refractive index of second medium.

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