Reflection and Refraction, Spherical Mirrors and Lenses NDA Questions

NDA Physics

Reflection and Refraction, Spherical Mirrors and Lenses MCQ Questions


7.
What happens to the speed of light when it travels from air into water?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the Wavelength
😑 View Answer Rough Work Error
ANSWER :
B. Decreases
8.
The speed of light is maximum in
A.
Air
B.
Water
C.
Glass
D.
Diamond
😑 View Answer Rough Work Error
ANSWER :
A. Air
9.
The critical angle for a medium-air boundary is 45 degrees. What is the refractive index of the medium?
A.
1.41
B.
0.71
C.
1
D.
2
😑 View Answer Rough Work Error
ANSWER :
A. 1.41
10.
Which type of mirror can form a real and inverted image?
A.
Concave mirror
B.
Convex mirror
C.
Plane mirror
D.
None of the above
😑 View Answer Rough Work Error
ANSWER :
A. Concave mirror
11.
What is the angle of incidence when a light ray undergoes total internal reflection?
A.
0 degrees
B.
90 degrees
C.
Greater than the critical angle
D.
None of the above
😑 View Answer Rough Work Error
ANSWER :
C. Greater than the critical angle
12.
What happens to the angle of reflection when a light ray strikes a surface at an angle of 45 degrees?
A.
It is 45 degrees
B.
It is 90 degrees
C.
It depends on the material of the surface
D.
None of the above
😑 View Answer Rough Work Error
ANSWER :
A. It is 45 degrees