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Reflection and Refraction of Light
239
22.4
(a)
The time for the light to travel to the stationary mirror and back is
(
)
3
4
8
2
35.0
10
m
2
2.33
10
s
3.00
10 m s
d
t
c
−
×
∆ =
=
=
×
×
At the lowest angular speed, the octagonal mirror will have rotated
1
in this
time, so
8 rev
min
4
1 8 rev
536 rev s
2.33
10
s
t
θ
ω
−
∆
=
=
=
∆
×
(b)
At the next higher angular speed, the mirror will have rotated
2
8 rev in the
elapsed time, or
(
)
3
2
min
2
2 536 rev s
1.07
10 rev s
ω
ω
=
=
=
×
22.5
(a)
For the light beam to make it through both slots, the time for the light to travel
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- Fall '10
- STAFF
- Physics, Light, Reflection And Refraction, 10 m, Rev, 360 degree, 2.500 M, ωmin
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