phy101 Assignment 5: (Fall 2010)

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[Xpert]

Q # 1
A ray of light in air strikes a glass surface. Is there a range of angles for which total
internal reflection occurs? Explain. Marks = 4
Q # 2
Interference can occur in thin film. Why is it important that the films be thin? Why don’t
you get these effects with a relatively thick film? Where should you put the dividing line
between “thin” and “thick”? Explain your reasoning. Marks = 6
Q # 3
Light traveling in air is incident on the surface of a block of plastic at an angle of 72.7° to
the normal and is bent so that it makes a 57.1° angle with the normal in the plastic. Find
the speed of light in the plastic. Marks = 6
Q # 4
Can water waves be reflected and refracted? Give examples. Does Huygens’s principle
apply to water waves? Explain. Marks = 4