Optics Problem 9.9.1


A beam of parallel rays propagating to the right is refracted upon entering and leaving another medium. Both the position of the source and the angle of the source can be adjusted by click-dragging the circular hotspots. Angles may also be measured by click- dragging away from the hotspots.


(a) A light source emits a beam as shown in the simulation. What is the index of refraction of the substance? You can click-drag both the position and the ray-angle for this source.  Start

(b) Click-drag the light source into the region of higher index of refraction. Adjust the angle of the source in order to demonstrate total internal reflection. What is the angle of total internal reflection?


(a) n=2.4.

(b) q = 24 degrees.


See Giancoli-PA: 23-5, Giancoli-SE: 33-5.


Physlet problem authored by Wolfgang Christian.

2000 by Prentice-Hall, Inc. A Pearson Company