Question

Shaving mirror, Rear-view mirror, street lamps, vigilance mirrors. Find the odd one out?
A. Shaving Mirror
B. Rear-view Mirror
C. Street lamp
D. Vigilance mirror

Answer 1

Hint: We know that there are two types of mirrors. One is the converging type, while the other is the diverging type. If we can identify what type of a mirror is used in these applications given in the options, we can find the odd one out.

Complete step by step answer:
In the case of a shaving mirror, a concave mirror is used. A concave mirror is a converging mirror.
The rest of the options, the rear-view mirror, vigilance mirror, street lamps are made of a convex mirror, which is a diverging mirror.
So, the odd one, in this case, is the shaving mirror which uses a concave mirror, while the rest of the options use a convex mirror in them.
So, the answer to the question is option (A).

Note: Depending on whether a mirror diverges or converges light, the mirrors are categorized into converging and diverging mirrors.
Convex Mirror: Convex mirror is a spherical mirror, which has its reflecting surface bulged outwards. It is also known as the diverging mirror since it diverges light strikes its reflecting surface. The image formed by these mirrors is usually virtual, erect and diminished.
Concave Mirror: Concave mirror is a spherical mirror, which has its reflecting surface bulged inwards. It is also known as the converging mirror since it converges light to the focal point in the principal axis when the light strikes its reflecting surface. The image formed by these mirrors can be real or virtual, depending on the position of the object on the principal axis.