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Science · 2026 · 4 marks
CBSE 2026 · Region 4 · Set 1 · Q38
The above ray diagram is to show image formation by a reflecting telescope. Reflecting telescope revolutionized our way of looking into the sky.…
The above ray diagram is to show image formation by a reflecting telescope. Reflecting telescope revolutionized our way of looking into the sky. Reflecting telescopes employ large mirrors to gather and focus light rather than relying solely on lenses as we do in the refracting telescopes. These telescopes utilize precisely shaped and polished mirrors to capture incoming light and reflect it to a focal point, where the telescope forms an image for observation.
(a)
What kind of image of a star is seen by the observer in the eye-piece ?
(b)
What kind of mirror is used in this reflecting telescope ?
(c)
Explain with the reason, what kind of optical device (type of lens or mirror) is used at the eye-piece.
OR
(c)
What is the role of plane mirror in image formation by this telescope ?
Marking-scheme solution
(a) Real / magnified.
(b) Converging / Concave mirror, Plane mirror
Convex lens
It magnifies the image formed by the curved mirror
OR
(c) The plane mirror redirects/ reflects the light rays coming from the curved mirror towards eyepiece.
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.