71st BPSC Prelims (2025), question 127

🔬 Science & Technology

  1. The focal distance of a plane mirror is

    1. +1 cm
    2. -1 cm
    3. 2 cm
    4. Infinity
    Show answer

    Answer: D — Infinity

    A plane mirror has infinite focal length (zero curvature).

Read the chapter this comes from

CareerCraft Labs is a private study platform. It is not a government body and is not affiliated with, endorsed by, or authorised by any examination authority. We do not accept applications, conduct examinations, or issue government results.

Official sources (1)

Bihar Public Service Commission