The mirror used as rear-view mirror in vehicles is
A. Parabolic mirror
B. Plane mirror
C. Convex mirror
D. Concave mirror
Answer: Option C
Solution (By JKSSB Mock Tests)
Convex mirror gives wider field of view, always forms virtual, erect, diminished image. Allows driver to see larger area. Concave can magnify but field narrow. Plane gives normal view but limited field.
Explanation:
Apparent frequency change depends on relative velocity between source and observer with respect to medium. Both motions contribute: f' = f(v±v_o)/(v∓v_s). Memory tip: 'Approaching ⇒ higher pitch; receding ⇒ lower pitch'. Conceptual question testing Doppler effect fundamentals, frequently examined in competitive exams.
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