Question

Which type of mirror is used in rear view mirrors of vehicles?

• A. Convex mirror
• B. Plane mirror
• C. Concave mirror
• D. None of these

Answer 1

Answer:

A. Convex mirror

Concave mirror:

• In a concave mirror, the outer surface of the sphere is reflecting surface
• The radius of curvature of a concave mirror is negative.
• A concave mirror converges all the light rays at a single point.
• A concave mirror may form a real image or a virtual image depending on the position of the image.
• Uses : Shaving mirrors, Head mirrors, Ophthalmoscope, Astronomical telescopes, Headlights, Solar furnaces etc.

Convex mirror:

• In a convex mirror, the inner surface of the sphere is a reflecting surface.
• The radius of curvature of a convex mirror is positive.
• A convex mirror diverges the light rays falling on it.
• A convex mirror always forms a virtual image.
• Uses : When convex mirrors are used, the magnification of objects becomes simple.
• It is used in sunglasses, rear-view mirror in automobiles, reflector for street lights etc