A driver of a car moving with 10 km/hr observes an image of a police jeep in his rear view (convex) mirror (focal length 50 m). He observes the image to be 40m inside mirror & approaching him at 2 km/hr.
(i)How far is the jeep from his car:
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Ans.
(i)
Sol.
+
=
⇒ u = – 200 m
(ii)
Sol. m =
⇒ m L =
=
⇒ v o = 50 km/hr
(iii)
Sol. obviously on ground velocity relative to ground is = 50+40= 90km/hr
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