PH 202

Quiz # 08 (10 pts)

Name

Solution

 

Bose-Einstein condensates can slow the speed of light down to  which means you could walk faster than the light would take to cross a 3.70 m long chamber filled with them.  What is the index of refraction for the Bose-Einstein condensates in the chamber?

 

A.

B.

C.

 

D.

 

 

 

So Correct Answer is C !

 

A ray of light is traveling in a proprietary type of glass, which has an index of refraction  when it strikes an interface with another index of refraction .  The angle of incidence is .  The angle of refraction is found to be .  What is the second index of refraction ?

 

A.

B.

C.

 

D.

 

 

Snell’s Law gives us

Solve for

 

 

So Correct Answer is B !

 

A glass jar contains pure olive oil .  A silver dollar appears to be  from the top of the olive oil when viewed from directly above (in air, ).  How far below the surface of the olive oil, is the coin actually?

 

A.

B.

C.

 

D.

 

 

 

Solve for object distance

 

 

Note: image distance is negative as it is a virtual image!

 

So Correct Answer is A !

 

A large vat is filled with milk, which has an index of refraction, .  The index of refraction of air is , .  At what angle of reflection will light be perfectly polarized horizontally?

 

A.

B.

C.

 

D.

 

 

Light is horizontally polarized when the angle of incidence and the angle of reflection is equal to Brewster’s angle found from

 

So for this problem

 

 

 

So the Correct Answer is B !

 

A salvage company comes across a body of water in which glycerin has been dumped and it is floating in a layer on top of the water.  While using lights placed in the glycerin layer to peer down into the water, they determine that a certain incident angle for the lights, the objects below the surface of the water can no longer be seen as all the light is reflected up.  At what angle does this occur?

 

Note:

 

A.

B.

C.

 

D.

 

 

We need the critical angle for total internal reflection.  Snell’s law gives us

 

 

Solve for the incident angle

 

 

 

So Correct answer is C !

 

 

 

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This page last updated on October 30, 2020