# Reflection at Plane and Curved Surfaces - Short Question Solution | Physics Grade XI

### Short Question Solution

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#### Kinematics

Introduction to Kinematics

# Reflection at Plane and Curved Surfaces - Short Question Answers

1. Does focal length change when the curved mirror is dipped in liquid?
For spherical mirror, the focal length and radius of curvature are related as, f = R/ 2. If f = ꚙ, then R = ꚙ which is the case of plane mirror. So, when focal length is equal to infinity, curved mirror may act as a plane mirror.

2. Can a convex mirror ever form real image? Justify your answer.
Yes, a convex mirror can form real image if the object is virtual. That is, if a converging beam is incident on a convex mirror, a real image is formed in front of it. In such case, the object distance is less than the focal length of the mirror.

3. Convex mirrors are used as rear-view mirrors in cars, why?
Convex mirrors are used as rear-view mirrors in cars to see the traffic at the backside. They provide wider angles of view so that the images are diminished and river can see his back side with a wide range of angle.

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