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The Lens System Used in a Galilean Telescope or Opera

Question 53

Multiple Choice

The lens system used in a Galilean telescope or opera glasses consists of a positive lens and a negative lens on the same axis.In the following ray diagrams the focal points of the positive lens are marked F and F' and those of the negative lens are marked f and f'.The points F and f' coincide.A ray of light comes from a distant object,traverses the system,and enters an eye on the right side of the diagram.Which of the ray diagrams is correct?


A) The lens system used in a Galilean telescope or opera glasses consists of a positive lens and a negative lens on the same axis.In the following ray diagrams the focal points of the positive lens are marked F and F' and those of the negative lens are marked f and f'.The points F and f' coincide.A ray of light comes from a distant object,traverses the system,and enters an eye on the right side of the diagram.Which of the ray diagrams is correct? A) B) C) D) E) None of these is correct
B) The lens system used in a Galilean telescope or opera glasses consists of a positive lens and a negative lens on the same axis.In the following ray diagrams the focal points of the positive lens are marked F and F' and those of the negative lens are marked f and f'.The points F and f' coincide.A ray of light comes from a distant object,traverses the system,and enters an eye on the right side of the diagram.Which of the ray diagrams is correct? A) B) C) D) E) None of these is correct
C) The lens system used in a Galilean telescope or opera glasses consists of a positive lens and a negative lens on the same axis.In the following ray diagrams the focal points of the positive lens are marked F and F' and those of the negative lens are marked f and f'.The points F and f' coincide.A ray of light comes from a distant object,traverses the system,and enters an eye on the right side of the diagram.Which of the ray diagrams is correct? A) B) C) D) E) None of these is correct
D) The lens system used in a Galilean telescope or opera glasses consists of a positive lens and a negative lens on the same axis.In the following ray diagrams the focal points of the positive lens are marked F and F' and those of the negative lens are marked f and f'.The points F and f' coincide.A ray of light comes from a distant object,traverses the system,and enters an eye on the right side of the diagram.Which of the ray diagrams is correct? A) B) C) D) E) None of these is correct
E) None of these is correct

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