Light (Part -1)

Total Questions: 50

11. _________ mirror is used in the headlights of cars. [S.S.C. Online CHSL (T-I) 25.01.2017 (Shift-II)]

(a) Semi-circular
(b) Conical
(c) Convex
(d) Concave

Correct Answer: (d) Concave

Solution:A concave mirror is used in the headlights of cars.

This type of mirror is a converging mirror that reflects light from the bulb placed at its focus, producing a powerful, parallel beam of light that can travel longer distances, ensuring effective illumination of the road ahead.

12. What is the shape of the reflectors of torches, headlights of cars and scooters? [S.S.C. Online MTS (T-I) 5.10.2017 (Shift-I)]

(a) Concave
(b) Convex
(c) Plane
(d) Cylindrical

Correct Answer: (a) Concave

Solution:The reflectors in torches, car headlights, and scooter headlights are typically concave in shape.

Torches: The inner surface of the reflector in torches acts as a concave mirror. This design focuses the light emitted by the bulb into a concentrated beam, ensuring high intensity and long-range illumination.
Car headlights: Reflector headlights in cars also utilize a concave or parabolic design. This shape helps concentrate and direct the light forward onto the road, minimizing scattering and enhancing visibilit
Scooter headlights : Similar to car headlights, scooter headlights use concave reflectors to focus the light effectively, ensuring good visibility for rider.
The concave shape is ideal for these applications because it reflects and focuses light into a near-parallel beam, increasing intensity and range.

13. Which mirror is used by doctors to examine an eye, ear, nose, and throat? [S.S.C. Online MTS (T-I) 17.09.2017 (Shift-III)]

(a) concave
(b) convex
(c) Ordinary
(d) flat

Correct Answer: (a) concave

Solution:Concave mirrors are used by doctors to examine the eyes, ears, and throat.

When a concave mirror is very close to the object, it gives a virtual erect and very large image, due to which the task of investigation becomes easy.

14. The image formed by a concave mirror is- [S.S.C. Online MTS (T-I) 5.10.2017 (Shift-III)]

(a) is always real.
(b) is always virtual.
(c) can be real or virtual.
(d) is neither real nor virtual.

Correct Answer: (c) can be real or virtual.

Solution:The image formed by a concave mirror can be both real and virtual.

When the object is between the pole and the principal focus, the virtual becomes real in the other case.

15. The image formed by a concave mirror________ than an object. [S.S.C. Online MTS (T-I) 4.10.2017 (Shift-II)]

(a) is always smaller
(b) is always larger
(c) is always equal
(d) can be smaller or larger

Correct Answer: (d) can be smaller or larger

Solution:A concave mirror is a spherical mirror, in which light is reflected from the recessed plane (deep plane).

The image of an object made of a concave mirror can be bigger or smaller than the object.
It depends on which position (distance) the object is placed relative to the mirror.

16. An overlapping field of view is observed by which mirror? [S.S.C. Online MTS (T-I) 19.09.2017 (Shift-I)]

(a) concave
(b) convex
(c) flat
(d) none of these

Correct Answer: (b) convex

Solution:In a convex mirror, the image of the object is virtual and smaller and erect than the object, that is, in a convex mirror, the image of the object of a much larger area is formed in a smaller area, and it is clear that the field of vision of a convex mirror is more.

It is used in motor vehicles.

17. The focal length of a plane mirror is _________. [S.S.C. Online MTS (T-I) 3.10.2017 (Shift-I) S.S.C. Online MTS (T-I) 30.10.2017 (Shift-I)]

(a) positive
(b) negative
(c) zero
(d) infinite

Correct Answer: (d) infinite

Solution:If a plane mirror is considered to be a part of a spherical mirror whose radius of curvature is infinite, then its focal length will also be infinite.

18. If a spherical mirror's reflecting surface is convex, it is a________ mirror. [S.S.C. Online MTS (T-I) 5.10.2017 (Shift-II)]

(a) Convex
(b) Concave
(c) Plane
(d) Plan convex

Correct Answer: (a) Convex

Solution:If the embossed plane of a spherical mirror is reflecting, then such a mirror is called a convex mirror.

The image formed by a convex mirror is virtual, erect, and smaller than the object.
Convex mirrors are used as rear view mirrors in vehicles.

19. When an object is placed between two parallel plane mirrors, what will be the number of images formed? [S.S.C. Online C.P.O.S.L. (T-I) 3.07.2017 (Shift-II)]

(a) 1
(b) 2
(c) 4
(d) Infinite

Correct Answer: (d) Infinite

Solution:Lateral Inversions for mirrors refer to the image being seen inverted in terms of what is left and right.

When facing a mirror, the left side of an object appears to be the right side of the virtual image in the mirror.

20. Which of the following types of mirrors show lateral inversion of light? [S.S.C. Online MTS (T-I) 13.10.2021 (Shift-II)]

(a) Concave Mirror
(b) Plane Mirror
(c) Rectangle Mirror
(d) Convex Mirror

Correct Answer: (b) Plane Mirror

Solution:

When an image is formed by a mirror such that the left side of the object appears on the right and the right side appears on the left, this phenomenon is called lateral inversion.

Lateral inversion occurs because a plane mirror reverses the image along the axis perpendicular to its surface, leading to the perception that left and right are swapped in the mirror image.
This is why words like "AMBULANCE" are written in reverse on vehicles, so they appear correctly in a driver's rear-view mirror

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