21. (a) We use the Rayleigh criteria. Thus, the angular separation (in radians) of the
sources must be at least
θ
R
= 1.22
λ
/
d
, where
λ
is the wavelength and
d
is the diameter of
the aperture. For the headlights of this problem,
( )
9
4
R
3
1.22 550 10 m
1.34 10 rad,
5.0 10 m
−
−
−
×
==
×
×
or
4
1.3 10 rad
−
×
, in two significant figures.
(b) If
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Light

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