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  9. Q315

RRB Group D (Level-1 posts) 2022 · Question 315 of 598

An optical device Y has a positive focal length. Y is:

  1. AEither a concave lens or a concave mirror
  2. BEither a convex lens or a convex mirrorCorrect
  3. CEither a convex lens or a concave mirror
  4. DEither concave lens or a convex mirror

Answer: B. Either a convex lens or a convex mirror

Explanation

Optical devices with positive focal lengths focus light rays rather than diverge them. Both convex lenses and convex mirrors have positive focal lengths, making them suitable candidates for device Y.

Source: RRB Group D 2022 Prev. Yr. Paper (18 Aug 2022) (Shift 2) - Prepp · reliable-secondary

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