Physics Secondary School Annual Examinations Form 5 - Directorate For Quality And Standards In Education, 2011 Page 5
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11P
4.
a.
The figure shows a
F
F’
•
•
parallel beam of light
incident on to a convex
lens PQ.
Q
20 cm
i.
1
What kind of beam is the emergent beam?
_______________
ii.
1
Determine the size of the focal length of the lens PQ.
_______________
iii.
Name the phenomenon which takes place when light rays bend as they pass through he
1
glass lens.
_______________
b.
8
The speed of light in air is 3 x 10
m/s (300 000 000 m/s).
Calculate the speed of light through the lens in m/s given that the refractive index of air
η
1
to glass (
) lens is 1.5.
a
g
M
c.
The ray diagram shows a ray of light AO incident on to a
A
plane mirror MM’ and the corresponding reflected ray OB.
65°
Use this ray diagram to determine the angle of
i
N
O
reflection r.
____________°
r
B
M’
2
d.
An object O is placed in front of the lens PQ as shown in the incomplete ray
diagram below.
P
O
•
•
•
•
F’
C
2F’
F
2F
Q
i.
Complete the above diagram by drawing a ray to show the position of the virtual image
1
obtained.
ii.
On the above diagram draw the virtual image obtained.
1
Physics – Secondary School – Form 5 - 2011
Page 5 of 11
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