Physics Sec Sample Paper I Worksheet - University Of Malta, 2012 Page 2
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111.
Joanne goes to the pool with her family. She spots a shiny coin at the bottom
of the pool as shown in the Diagram 1.
P
Diagram 1
coin
(a)
Joanne dives in because she thinks that the coin is really close. This
effect is caused by ________________________
(1)
(b)
On Diagram 1 above, mark:
(i)
the ray of light as it emerges at point P.
(1)
(ii)
the normal, the angle of incidence and the angle of refraction as
the ray of light emerges from under the water.
(3)
(c)
The pool is 2 m deep but the coin appears to be only 1.5 m below the
surface of the pool. Calculate the refractive index of the water.
_____________________________________________________________________
_____________________________________________________________________
(2)
(d)
Calculate the speed of light in the water if the speed of light in air is
8
3 x 10
m/s (300,000,000 m/s).
_____________________________________________________________________
_____________________________________________________________________
(2)
(e)
Joanne felt very lucky to have been able to see the coin. Explain why
Joanne would not see the coin if the angle of incidence in water is
greater than the critical angle.
_____________________________________________________________________
(1)
Page 2 of 11
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