(^104) Aptitude Test Problems in Physics
sure had to be changed for obtaining a good
picture and explain why.
4.14•. A fisherman lives on the shore of a
bay forming a wedge with angle a in a house
located at point A (Fig. 119). The distance
S.
Fig. 119
from point A to the nearest point C of the
bay is h, and the distance from point D
to roint A is 1. A friend of the fisherman
lives across the bay in a house located at
point B. Point B is symmetric (relative to the
bay) to point A. The fisherman has a boat.
Determine the minimum time t required
for the fisherman to get to his friend from
the house provided that he can move along
the shore at a velocity v and row the boat
at half that velocity (n = 2).
4.15. The image of a point source S' lying
at a distance b from a transparent sphere is
formed by a small diaphragm only by rays
close to the optical axis (Fig. 120).
Where will the image be after the sphere
is cut into two parts perpendicular to the
horizontal axis, and the plane surface of
the left half is silvered?
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