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प्रश्न
What is the advantage of using a convex mirror as rear-view mirror in vehicles as compared to a plane mirror? Illustrate your answer with the help of labelled diagrams.
उत्तर
A convex mirror has a wider field of view, and always forms virtual, erect and small-sized images of a large number of objects at the same time. Size of the image formed by a plane mirror is equal to the size of the object; hence, it has a small field of view as compared to the convex mirror. Thus, a convex mirror is used as a rear view mirror in a car.
Following ray diagram explains it all:
संबंधित प्रश्न
Find the nature and focal length of a spherical mirror whose radius of curvature is +24 cm.
What is meant by (i) principal focus of a convex mirror, and (ii) focal length of a convex mirror?
In a convex spherical mirror, reflection of light takes place at:
(a) a flat surface
(b) a bent-in surface
(c) a bulging-our surface
(d) an uneven surface
If you want to see an enlarged image of your face, state whether you will use a concave mirror or a convex mirror?
What happens to the image when the object is moved away from the mirror gradually?
Whatever be the position of the object, the image formed by a mirror is virtual, erect and smaller than the object. The mirror then must be:
(a) plane
(b) concave
(c) convex
(d) either concave or convex
An arrow 2.5 cm high is placed at a distance of 25 cm from a diverging mirror of focal length 20 cm. Find the nature, position and size of the image formed.
Write true or false
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
A ............ mirror always forms a virtual image.
Identify the device used as a spherical mirror or lens in following case, when the image formed is virtual and erect in case.
Object is placed between the focus and device, image formed is enlarged and on the same side as that of the object.
