3. i) Give two uses each of a concave and a convex mirror.
ii) The rear view mirror of a car is a plane mirror. A driver is reversing his car
at a speed of 4 m/s. The driver sees in his rear view mirror the image of a truck
parked behind his car. The speed at which the image of the truck appears to
approach the driver will be
(i) 1 m/s (ii) 2 m/s
(iii) 4 m/s (iv) 8 m/s
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Explanation:
1. Concave Mirrors are used as shaving mirror to see a large image of the face. Concave Mirror are used by dentist to see a large image of the teeth of patients. Concave Mirrors are used as reflectors in torches, Concave reflectors are also used in room heater. ... Convex Mirror are used in cars, trucks and buses
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A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear new mirror image of a truck parked behind his car. ... An object of height 4 cm is placed at 30 cm from a concave mirror of focal length 2 0 cm.
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