Practice MCQ Questions and answers on Physics-GK

Convex mirrors are used as side view mirrors in a car to see the traffic behind. This is because of the following reasons: The image formed in a convex mirror is highly diminished due to which a convex mirror gives a wide field of view of the traffic behind the vehicle.

A convex mirror bends light as it reflects the light, and the farther away a point is from the center, the more the light is bent. As a result, an image formed in a convex mirror is smaller than an image in a plane (flat) mirror.

Land covered with fresh snow reflects back more sunlight as compared to other three. Fresh snow and ice reflect 80 - 85% of the sunlight.

Convex mirror is generally used in rear view mirror.

For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). As the angle of incidence increases so does the angle of refraction.

We use convex mirror as a rear view mirror in the vehicles because convex mirror always forms virtual, erect and diminished images irrespective of distance of the object. A convex mirror enables a driver to view large area of the traffic behind him. Convex mirror forms very small image than the object.We use convex mirror as a rear view mirror in the vehicles because convex mirror always forms virtual, erect and diminished images irrespective of distance of the object. A convex mirror enables a driver to view large area of the traffic behind him. Convex mirror forms very small image than the object.

Mirrors, spherical or otherwise are based on the laws of reflection. That behavior is not affected by the medium in which the light travels, so the mirror's focal length would be no different in air or any other medium.

Mirage is a phenomenon due to total internal reflection of light. It happens when the light goes from optically denser medium (cool air) to rarer medium (hot air) and angle of incidence is equal to or greater than the critical angle resulting total internal reflection at the interface of the two mediums.

Rear view mirror of car is convex.