Consider a ray of light that propagates from air ( n=1 ) to any one of the materials listed below. Assuming that the ray strikes the interface with any of the listed materials always at the same angle θ1 , in which material will the direction of propagation of the ray change the most due to refraction?What is the critical angle θcrit for light propagating from a material with index of refraction of 1.50 to a material with index of refraction of 1.00? When light propagates through two adjacent materialsthat have different optical properties, some interestingphenomena occur at the interface separating the twomaterials. For example, consider a ray of light thattravels from air into the water of a lake As the raystrikes the air-water interface (the surface of the lake), itis partly reflected back into the air and partly refractedor transmitted into the water This explains why on thesurface of a lake sometimes you see the reflection ofthe surrounding landscape and other times theunderwater vegetation.These effects on light propagation occur because lighttravels at different speeds depending on the medium.The index of refraction of a material, denoted by n.gives an indication of the speed of light in the material.It is defined as the ratio of the speed of light c invacuum to the speed v in the material, orFigure1 of 1incidentreflectedrayrayinterfacerefractedraynormal

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University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter3: Interference

Section: Chapter Questions

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Consider a ray of light that propagates from air ( n=1 ) to any one of the materials listed below. Assuming that the ray strikes the interface with any of the listed materials always at the same angle θ1 , in which material will the direction of propagation of the ray change the most due to refraction? What is the critical angle θcrit for light propagating from a material with index of refraction of 1.50 to a material with index of refraction of 1.00?

When light propagates through two adjacent materials
that have different optical properties, some interesting
phenomena occur at the interface separating the two
materials. For example, consider a ray of light that
travels from air into the water of a lake As the ray
strikes the air-water interface (the surface of the lake), it
is partly reflected back into the air and partly refracted
or transmitted into the water This explains why on the
surface of a lake sometimes you see the reflection of
the surrounding landscape and other times the
underwater vegetation.
These effects on light propagation occur because light
travels at different speeds depending on the medium.
The index of refraction of a material, denoted by n.
gives an indication of the speed of light in the material.
It is defined as the ratio of the speed of light c in
vacuum to the speed v in the material, or
Figure
1 of 1
incident
reflected
ray
ray
interface
refracted
ray
normal

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