Question

_________ are used as reflectors in the torchlights.
A. Concave mirrors
B. Plane mirrors
C. Convex mirrors
D. None of the above

Answer 1

A reflector is a specially designed reflecting surface that is used to focus light towards a certain topic or scene. When a beam of light strikes a painted or polished surface, it is reflected back to the source. When highly polished metal surfaces are formed into the shape of a parabola, they act as mirrors, concentrating light from a light source positioned in the parabola's focus.

Complete step-by-step solution:
Option A: The light bulb in the torch is placed at the concave reflector's focus, which provides a powerful beam of light.
So, option A is correct.
Option B: Convex mirrors are utilised in automobiles because they produce an upright picture and a broader field of view due to their curved outwards design. Hospitals, hotels, schools, businesses, and apartment complexes all have convex mirrors in their hallways.
So, option B is incorrect.
Option C: As a viewing glass, plane mirrors are often used. Used as blind turns on some busy roadways to notice vehicles approaching from the opposite direction. Kaleidoscopes are made with them.
So, option C is incorrect.
Option D: A torch has a bulb that is powered by a battery. The light beams from a bulb are spread out in all directions. This indicates that it deviates significantly. A concave mirror minimises divergence and is a converging mirror.
So, option D is incorrect.
Option A is the correct answer.

Note: A convex mirror has a curved reflecting surface that bulges out towards the light source. Convex mirrors are commonly seen in corridors of retailers, schools, hospitals, hotels, and apartment complexes. A concave mirror is a sort of spherical mirror in which the reflecting surface is the sphere's inner curved surface, i.e., the reflecting surface seems to be distant from the incident light source with this form of mirror.