Shareem Hutcherson (Student - section: 953) LON-CAPA Logo Messages Courses Help

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Shareem Hutcherson (Student - section: 953) LON-CAPA Logo Messages Courses Help Logout PHYS 202-R (Spring 2017) Main MenuContentsGradesSyllabus TimerTimer Notes tationsNotes Evaluate thisEvaluate Feedback discussFeedback Print printoutPrint Info infoInfo Course Contents » ... » HW #8 - due SUN 3/26 at 11pm » Refraction and Total Internal Reflection A light beam goes from a medium with index of refraction 1.4 into another medium with index of refraction 3.3. Inside the new medium, which of the following is true? The wavelength stays the same. The light beam moves slower. The light beam moves faster. The light beam moves with the same velocity. The frequency becomes higher. Tries 0/2
What is the critical angle of total internal reflection? 17.6° 25.1° 45.6° None of the above. Tries 0/2
What is the critical angle of total internal reflection if the beam direction is reversed, i.e., if the beam goes from the medium with index of refraction 3.3 into the medium with index of refraction 1.4? 17.6° 25.1° 45.6° None of the above. Tries 0/2
Shareem Hutcherson (Student - section: 953) LON-CAPA Logo Messages Courses Help Logout PHYS 202-R (Spring 2017) Main MenuContentsGradesSyllabus TimerTimer Notes tationsNotes Evaluate thisEvaluate Feedback discussFeedback Print printoutPrint Info infoInfo Course Contents » ... » HW #8 - due SUN 3/26 at 11pm » Refraction and Total Internal Reflection A light beam goes from a medium with index of refraction 1.4 into another medium with index of refraction 3.3. Inside the new medium, which of the following is true? The wavelength stays the same. The light beam moves slower. The light beam moves faster. The light beam moves with the same velocity. The frequency becomes higher. Tries 0/2
What is the critical angle of total internal reflection? 17.6° 25.1° 45.6° None of the above. Tries 0/2
What is the critical angle of total internal reflection if the beam direction is reversed, i.e., if the beam goes from the medium with index of refraction 3.3 into the medium with index of refraction 1.4? 17.6° 25.1° 45.6° None of the above. Tries 0/2
Shareem Hutcherson (Student - section: 953) LON-CAPA Logo Messages Courses Help Logout PHYS 202-R (Spring 2017) Main MenuContentsGradesSyllabus TimerTimer Notes tationsNotes Evaluate thisEvaluate Feedback discussFeedback Print printoutPrint Info infoInfo Course Contents » ... » HW #8 - due SUN 3/26 at 11pm » Refraction and Total Internal Reflection A light beam goes from a medium with index of refraction 1.4 into another medium with index of refraction 3.3. Inside the new medium, which of the following is true? The wavelength stays the same. The light beam moves slower. The light beam moves faster. The light beam moves with the same velocity. The frequency becomes higher. Tries 0/2
What is the critical angle of total internal reflection? 17.6° 25.1° 45.6° None of the above. Tries 0/2
What is the critical angle of total internal reflection if the beam direction is reversed, i.e., if the beam goes from the medium with index of refraction 3.3 into the medium with index of refraction 1.4? 17.6° 25.1° 45.6° None of the above. Tries 0/2

Explanation / Answer

The light beam moves slower.

Reason : speed of light in a medium is given as

v = c/ n                 where c = speed of light in vaccum = 3 x 108 m/s  

                                  n = index of refraction of medium

as the light travels from one medium to another , the index of refraction increases , hence as per the formula , due to inverse relationship between v and n , the speed of light "v" will decrease

for Total internal reflection to take place, the primary condition is that the beam must be travelling from denser to rarer medium. But in the problem , the beam is travelling from n = 1.4 (rarer) to n = 3.3 (denser) . hence Total internal reflection will not take place

n1 = 3.3 ,

i = angle of incidence or critical angle

n2 = 1.4

r = angle of refraction = 90

using snell's law

n1 Sini = n2 Sinr

3.3 Sini = 1.4 Sin90

i = 25.1

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