Ray Says That Interference Effects Cannot Be Observed with Visible

question 7

Multiple Choice

Ray says that interference effects cannot be observed with visible light because random phase changes occur in time intervals less than a nanosecond.Stacy says that doesn't matter if collimated light from a single source reaches multiple openings.(They are arguing about a light source 50.0 cm away from two 0.010 0 mm-wide slits,2.00 mm apart,with a screen 1.00 m away from the slits. ) Which one,if either,is correct,and why?

• A)Ray,because the phases at the two slits will be random and different.
• B)Ray,because it takes light over 3 ns to travel 1.00 m to the screen.
• C)Stacy,because the difference in time of travel from the source to the slits is no more than about 7 *10 ^{- 12} s.
• D)Stacy,but only if a lens is placed in front of the slits.
• E)Both,because interference of light never occurs outside a physics lab.

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