Question

1.
The radius of curvature of a spherical mirror is 20 cm. What is its local
Name a mirror that can give an erect and enlarged image of an object
Define the principal focus of a concave mirror.
2.
3.
Why do we prefer a convex mirror as a rear-view mirror in vehicles?
length?​

Answer 1

Answers:

1. focal length = 1/2 Radius of curvature

= 1/2x 20

=10 cm

2. A concave mirror gives an erect and enlarged image of an object held between pole and principal focus of the mirror.

3. Principal focus of concave mirror is the point on the principal axis through which light rays incident parallel to the principal axis , pass after the reflection from the mirror.

4. We prefer a convex mirror as a rear-view mirror in vehicles because it gives a wider field of view, which allows the driver to see most of the traffic behind him. Convex mirrors always form a virtual, erect, and diminished image of the objects placed in front of it.

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