MULTIPLE CHOICE 1.) When you shine a very narrow beam of white light on twonarro

Question

MULTIPLE CHOICE

1.) When you shine a very narrow beam of white light on twonarrow closely spaced slits in a dar room, what do you see on a screen beynd the slits?

a.) A sharp image of the slits on the screen

b.) A pattern of white and dark spots of approximately equal width

c.) A set of wide colored spectra with narrow dark spots between them

d.) A wide white spot in the center and a set of spectra separated by narrow dark spots

2.) If you add a third slit to double slits and shine the same laser beam on the three slits, what will the patten have?

a.) More dark and bright fringes

b.) Bright fringes farther apart

c.) Dark fringers farther apart

d.) The centers of the bright fringes will be the same distance from each other but their width will be narrower

3.) You shine a laser beam through a grating witih a known number of slits per millimeter and observe a pattern on a screen. Then you cover half of the grating with nontransparent material. What will you see?

a.) There will be half as many bright fringes on the screen

b.) The bright fringes will be twice as close

c.) The bright fringes will be two times farther apart

d.) The location of the fringes will not change, but they will be a little bit wider and less bright

4.) You shine a light of different colors on the same lens. The focal lenght of the lens for blue light

a.) is shorter than for red light.

b.) is longer than for red light.

c.) is the same as for red light, because focal length is a property of the lens, not hthe light shining on it.

d.) depends on the location of the source of light.

Explanation / Answer

(1)

b

(2)

a

(3)

d

(4)

b

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