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Unformatted text preview: Assignment 2 1. A fisherman 2 meters from shore sees a ﬁsh directly below. His one meter tall
partner stands next to shore. He sees the ﬁsh and measures an angle of 45° for
the light ray from the ﬁsh exiting the water surface. How deep should the
ﬁsher in the boat quickly cast his net to catch the ﬁsh? ._ “.0
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6+: 320 2. Consider a 1 cm high object placed in front of a lens having a focal length of S
cm. For object positions of 20, 7.5 and 2.5 cm, ﬁnd:
a) the image position
b) the magniﬁcation
c) draw a neat diagram showing the directions of the light rays
d) Is the image real or virtual, erect or inverted? 3. 4. Repeat question 2 for the same object if it is placed 20 cm in front of a concave
lens having a focal length of 5 cm. Explain using a diagram what farsightedness is and how it is corrected with
glasses. Objm
at DC) A laser beam having a diameter of 2 mm is to be expanded by a factor of 4.
Draw a diagram of how one can create a beam expander using two convex
lenses. Specify the focal length of the lenses and their positions using a ...
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 Winter '10
 A

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