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Draw the ray diagram for a Cassegrain telescope - AQA - A-Level Physics - Question 1 - 2017 - Paper 4
Question 1
Draw the ray diagram for a Cassegrain telescope. Your diagram should show the paths of two rays, initially parallel to the principal axis, as far as the eyepiece.
Worked Solution & Example Answer:Draw the ray diagram for a Cassegrain telescope - AQA - A-Level Physics - Question 1 - 2017 - Paper 4
Step 1
Draw the Diagram of a Cassegrain Telescope
Answer
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Start with a concave primary mirror, which is typically large and parabolic in shape, positioned in the center of your drawing.
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Place a smaller, convex secondary mirror above the primary mirror. Ensure it is positioned slightly above and towards the focal point of the primary mirror. Label both mirrors clearly.
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Draw two rays that are initially parallel to the principal axis. These rays should come from a distant object and head towards the primary mirror.
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When the rays hit the primary mirror, they will reflect towards the secondary mirror. Make sure the rays reflect off the mirror correctly, converging towards the secondary mirror.
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The secondary mirror will reflect the rays further towards the eyepiece. Indicate this direction clearly in your diagram.
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To represent the eyepiece, draw a line at the focal point of the secondary mirror where the reflected rays converge. Label this as the eyepiece location.
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Ensure that the rays are drawn straight and clearly show their paths from the object, through the mirrors, and into the eyepiece.