Light in semi-cylinder
Monochromatic lights
A
and
B
are entered at points
p
and
q
, respectively, on the cross section of a semi-cylinder glass, as shown above left. Point
O
is the center of the cross section of the semi-cylinder glass. As shown above right, the paths of
A
and
B
are parallel, and they meet the curved surface of the semi-cylinder glass with angles
and
, respectively, which are the critical angles of the two monochromatic lights. Which of the following statements is correct?
The refractive index of the air is .
a) The wavelength of light
A
in the glass is longer than that of light
B
in the glass.
b) If the monochromatic light
A
enters at point
q
instead of
p
, then it will totally be reflected internally.
c) If a light with a shorter wavelength than the monochromatic light
A
is entered at point
p
, then it will totally be reflected internally.
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