Explain the role of forest in maintaining the balance between oxygen
and carbon dioxide in the atmosphere.
The rear view mirror of a car is a plane mirror. A driver is reversing his
car at a speed of 2 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
David is observing his image in a plane mirror. The distance between
the mirror and his image is 4 m. If he moves 1 m towards the mirror,
then the distance between David and his image will be
(i) 3 m (ii) 5 m
(iii) 6 m (iv) 8 m
A virtual image larger than the object can be produced by a
(i) concave lens (ii) concave mirror
(iii) convex mirror (iv) plane mirror
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