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Both students i.e. Student 1 and Student 2, had an intention of stargazing at night and knew that a…
Both students i.e. Student 1 and Student 2, had an intention of stargazing at night and knew that a telescope would be required for viewing distant stars. Student 1 visited a shop to purchase the necessary equipment for stargazing and purchased two lenses X and Y, the former being thicker and the latter thinner. On the other hand, Student 2 opted for a different approach. He decided to build his telescope by combining a concave mirror of focal length 25 cm and a plane mirror, along with a convex lens of focal length 5 cm.
(a)
Which lens would Student 1 use as an objective, X or Y?
(b)
Give any one advantage of the telescope of Student 2 over the telescope of Student 1.
(c)
What is the length of the telescope of Student 1 when the final image is formed at infinity, assuming she uses the same eyepiece as Student 2 but achieves twice the magnifying power?
Answer
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From ISC 2025 Practice Physics, question 67.