A reflecting telescope uses curved mirrors and a plane mirror to form an image at the eye-piece. Explain with the reason, what kind of optical device (type of lens or mirror) is used at the eye-piece.
Refraction by spherical lenses and image formation
Usually 1 marks a paper · mostly MCQs and case-based questions · asked in 2 of the last papers
Notes are being written
The board questions below are real and complete — they come from the CBSE papers themselves. The written notes for this topic are still being prepared.
Board questions on this topic
2 from the CBSE papers we hold — the exact wording the board used.
At what distance from a convex lens should an object be placed to get an image of the same size as that of the object on a screen?
- (a) Beyond twice the focal length of the lens.
- (b) At the principal focus of the lens.
- (c) At twice the focal length of the lens.
- (d) Between the optical centre of the lens and its principal focus.