Polarized Light

   

1)      Unpolarized light is shone at a vertical polarizing filter. Through the filter you get

a)      all the lightb)      half the lightc)      1/4 of the lightd)      nothing

?

2)      Unpolarized light is shone at a polarizing filter. The light that gets through it then meets another filter oriented the same way. Through both filters you will get

a)      all the lightb)      half the lightc)      one quarter of the lightd)      nothing

?

3)      Unpolarized light is shone at a polarizing filter at 0o and then another at 90o. Through both filters you will get

a)      all the lightb)      half the lightc)      one quarter of the lightd)      nothing

4)      How are polarizing filters different from regular filters?

What’s wrong with this diagram?

5)      Unpolarized light is shone at a polarizing filter at 0o and then another at 45o. Through both filters you will get

a)      half the lightb)      one quarter of the lightc)      one eighth of the lightd)      nothing

½ x ½ = ¼

The first filter reduces the light by ½. The second filter reduces it by ½ again.

However, the component is 0.707, not 0.5.

How can you get ½?cos2(45) = ½

6)      Unpolarized light is shone at a polarizing filter at 0o and then another at 30o. The first filter multiplies it by one half and the second multiplies it by

a)      one halfb)      three halvesc)      one quarterd)      three quarters

7)      Unpolarized light is shone at a polarizing filter 0o and then another at 45o and then another at 90 o. Through all three filters you will get

a)      one quarter of the lightb)      one eighth of the lightc)      one sixteenth of the lightd)      none of the light

8)      Which set of filters will pass more light? A filter at 0 o and then

a)      90 o

b)      45 o then 90 o

c)      30 o then 60 o then 90 o

d)      22.5 o then 45 o then 67.5 o then 90 o

0.5 x 0.92 x 0.92 x 0.92 x 0.92 = 0.73

9)      What is the effect of the calcite crystal on light?