Optics AFCAT Questions

AFCAT Physics

Optics MCQ Questions


13.
The mirror formula for spherical mirrors is:
A.
1/f = 1/v × 1/u
B.
1/v - 1/u = 1/f
C.
1/v + 1/u = 1/f
D.
v + u = f
😑 View Answer Rough Work Error
ANSWER :
C. 1/v + 1/u = 1/f
14.
The magnification produced by a spherical mirror is given by:
A.
m = u/v
B.
m = -u/v
C.
m = v/u
D.
m = -v/u
😑 View Answer Rough Work Error
ANSWER :
D. m = -v/u
15.
An object is placed at the center of curvature of a concave mirror. The image formed is:
A.
Real, inverted, and same size as the object
B.
Virtual, erect, and magnified
C.
Real, inverted, and diminished
D.
Real, inverted, and magnified
😑 View Answer Rough Work Error
ANSWER :
A. Real, inverted, and same size as the object
16.
An object is placed at the focus of a concave mirror. The image is formed at:
A.
The pole
B.
Infinity
C.
The center of curvature
D.
The focus itself
😑 View Answer Rough Work Error
ANSWER :
B. Infinity
17.
An object is placed between the pole and focus of a concave mirror. The image formed is:
A.
Real, inverted, and diminished
B.
Virtual, inverted, and diminished
C.
Real, erect, and same size
D.
Virtual, erect, and magnified
😑 View Answer Rough Work Error
ANSWER :
D. Virtual, erect, and magnified
18.
A concave mirror has a focal length of 10 cm. An object is placed 30 cm in front of it. The position of the image is:
A.
20 cm behind the mirror
B.
10 cm in front of the mirror
C.
15 cm in front of the mirror
D.
30 cm in front of the mirror
😑 View Answer Rough Work Error
ANSWER :
C. 15 cm in front of the mirror