Waves
Snell law n1 sin i =:
A) n2 sin r
B) n2 cos r
C) n1 cos i
D) sin r only
Refractive index n equals:
A) c/v
B) v/c
C) f lambda
D) 1 always
Total internal reflection when:
A) Angle > critical and denser to rarer
B) Any angle
C) Rarer to denser only
D) Normal incidence
Diffraction is:
A) Bending around obstacles
B) Only reflection
C) Only absorption
D) Only polarization
Interference needs:
A) Coherent sources
B) Random phases only
C) Single frequency forbidden
D) No waves
Constructive interference path difference:
A) n lambda
B) lambda/2 odd
C) Zero only
D) Random
Destructive interference path diff:
A) (n+1/2) lambda
B) n lambda
C) Zero only
D) 2 lambda always
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