BPSC – Combined Competitive Examination · ಪ್ರಶ್ನೆ 127
The focal length of a plane mirror is:
ಉತ್ತರ ತೋರಿಸು ಮತ್ತು ವಿವರಣೆ
ಉತ್ತರ: (D) Infinity
ವಿವರಣೆ
A plane mirror can be seen as a sphere of infinite radius, so its focal length is infinite.
- (A) ತಪ್ಪು
Wrong: a plane mirror has no finite focus.
- (B) ತಪ್ಪು
Wrong: a plane mirror has no finite focus.
- (C) ತಪ್ಪು
Wrong: a plane mirror has no finite focus.
- (D) ಸರಿ
Correct: its radius of curvature is infinite, so f = R/2 is infinite.