Question:
Which type of mirror is used in rear view mirrors of vehicles?
AConvex mirror
BPlane mirror
CConcave mirror
DNone of these
Answer:
A. Convex mirror
Explanation:
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