Unformatted text preview: Assignment 2 A ﬁsherman 2 meters from shore sees a ﬁsh directly below. His partner on
shore also sees the ﬁsh and measures an angle of 45° for the light ray from the
ﬁsh exciting the water surface. How deep should the ﬁsher in the boat quickly
cast his net to catch the ﬁsh? Consider a 1 cm high object placed in front of a lens having a focal length of 5
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? 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. 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
diagram. ...
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 Winter '10
 A

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