Question

Give reasons 1. concave mirror is used as shaving mirror 2. a mirror used as search lights 3. a mirror is used.as rear view mirror 4. mirror used in solar furances

Answer 1

answers point wise
1)Concave mirror is used as shaving mirror because when the object is palced between focus and pole ,the mirror gives a virtual and enlarged image.
2)it is used in search lights as the source of light is placed just at focus of the concave mirror and a parallel beam of light is obtained by reflection.
3)Convex mirrors are used as rear ciew mirrors in vehicles(cars,trucks,buses,etc.)to see traffic at the backside. This is due to the following reasons:
(a) Convex mirrors always form an erect and diminised image.
(b)They have a wider field of view as they are curved outwards.
For this purpose. plane mirrors may also be used. But a convex mirror is preferred because the field of view is wider than that of a plane mirror.
4) here the concave mirror is used to concentrate the sun's power at one point the focus where the object is kept

Answer 2

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