Optics AFCAT Questions

AFCAT Physics

Optics MCQ Questions


13.
Power of a lens is measured in:
A.
Diopters
B.
Lumens
C.
Newtons
D.
Hertz
😑 View Answer Rough Work Error
ANSWER :
A. Diopters
14.
The refractive index is defined as:
A.
Speed of light in a medium divided by the speed of light in vacuum
B.
Speed of light in vacuum divided by the speed of light in a medium
C.
Speed of light in air divided by speed of light in water
D.
None of the above
😑 View Answer Rough Work Error
ANSWER :
B. Speed of light in vacuum divided by the speed of light in a medium
15.
A lens of power +2 D is a:
A.
Concave lens
B.
Convex lens
C.
Plane lens
D.
Cylindrical lens
😑 View Answer Rough Work Error
ANSWER :
B. Convex lens
16.
The optical center of a lens is:
A.
The geometric center of the lens
B.
The point where light rays converge
C.
A point within the lens where light passes undeviated
D.
The point of maximum curvature
😑 View Answer Rough Work Error
ANSWER :
C. A point within the lens where light passes undeviated
17.
The magnification of a plane mirror is always:
A.
Greater than 1
B.
Less than 1
C.
Exactly 1
D.
Zero
😑 View Answer Rough Work Error
ANSWER :
C. Exactly 1
18.
What type of image is formed by a convex mirror?
A.
Real and inverted
B.
Virtual and upright
C.
Real and upright
D.
Virtual and inverted
😑 View Answer Rough Work Error
ANSWER :
B. Virtual and upright