Optics CDS Questions

CDS Physics

Optics MCQ Questions


1.
The Laws of Reflection of light state that the angle of incidence is equal to the angle of reflection, and that:
A.
The angle of incidence is always greater than the angle of reflection
B.
Reflection occurs only when light strikes a transparent surface
C.
The incident ray and reflected ray always lie on opposite sides of the reflecting surface
D.
The incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane
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ANSWER :
D. The incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane
2.
When a ray of light strikes a plane mirror at an angle of 30° to the normal, the angle of reflection will be:
A.
15°
B.
30°
C.
60°
D.
90°
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ANSWER :
B. 30°
3.
An object is placed at a distance of 0.5 m in front of a plane mirror. The total distance between the object and its image will be:
A.
2.0 m
B.
0.25 m
C.
0.5 m
D.
1.0 m
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ANSWER :
D. 1.0 m
4.
The image formed by a plane mirror is characteristically:
A.
Real, inverted, and magnified
B.
Real, erect, and of variable size depending on distance
C.
Virtual, erect, and of the same size as the object, but laterally inverted
D.
Virtual, inverted, and diminished
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ANSWER :
C. Virtual, erect, and of the same size as the object, but laterally inverted
5.
Two plane mirrors are placed at an angle of 60° to each other. How many images of a single object placed between them will be formed?
A.
5
B.
3
C.
6
D.
2
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ANSWER :
A. 5
6.
A concave mirror is characterised by which of the following surface properties?
A.
It cannot reflect light at all, only refract it
B.
It has a perfectly flat reflecting surface
C.
Its reflecting surface curves inward, like the inside of a bowl, and it can converge parallel rays of light to a focal point
D.
Its reflecting surface curves outward, like the outside of a ball
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ANSWER :
C. Its reflecting surface curves inward, like the inside of a bowl, and it can converge parallel rays of light to a focal point