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General Science question from Panchayat Secretary (VLW) exam, 2025 by JKSSB

The focal length of a spherical mirror is approximately equal to

Last updated Jun 17, 2026
Correct Answer: Option B — Half the radius of curvature
For a spherical mirror (both concave and convex) with a small aperture, the focal length (f) is directly related to its radius of curvature (R) by the following formula:

f= 
2
R
​
 
This means the principal focus lies exactly halfway between the pole of the mirror and its center of curvature.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.
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JKSSB Panchayat Secretary (VLW) 2025

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Exam JKSSB
Recruitment Panchayat Secretary (VLW)
Year 2025
Subject General Science
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