College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:A point source of light is submerged 2.7 m below the surface of a lake and emits rays in all directions. On the surface of the lake,
directly above the source, the area illuminated is a circle. What is the maximum radius that this circle could have? Take the refraction
index of water to be 1.333.
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Step 1: Given data and concept used
Point source is at a depth of d =2.7m below the water surface
Refractive index of the water is 1.333
We will use the concept of total internal reflection.
When light comes out of the water it bend away from normal, for a particular angle of incidence the rays emerges parallel to the surface of water, if you further increase the angle of incidence the rays of light gets reflected in the same medium i.e. water itself
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