Refraction of Light at Plane and Spherical Surfaces NEET Questions

Physics - Optics

Refraction of Light at Plane and Spherical Surfaces MCQ Questions


13.
A pin is placed 10 cm in front of a glass slab of refractive index 1.5 and thickness 6 cm. The shift in the apparent position of the pin is:
A.
1.5 cm (away from the slab)
B.
2 cm (towards the slab)
C.
4 cm (away from the slab)
D.
6 cm (towards the slab)
😑 View Answer Rough Work Error
ANSWER :
B. 2 cm (towards the slab)
14.
A vessel of depth 30 cm is half filled with water (n = 4/3) and the other half with oil (n = 1.5). The apparent depth of the bottom from the top is:
A.
22.5 cm
B.
25 cm
C.
20 cm
D.
30 cm
😑 View Answer Rough Work Error
ANSWER :
A. 22.5 cm
15.
When a ray of light passes through a parallel-sided glass slab, the emergent ray is:
A.
Parallel to the incident ray but laterally displaced
B.
Bent towards the normal
C.
Along the same line as the incident ray with no shift
D.
Perpendicular to the incident ray
😑 View Answer Rough Work Error
ANSWER :
A. Parallel to the incident ray but laterally displaced
16.
The lateral shift produced by a glass slab of thickness t, when light is incident at angle i and refracted at angle r is:
A.
t × sin(i + r)
B.
t × tan(i - r)
C.
t × cos(i - r)
D.
t × sin(i - r) / cos(r)
😑 View Answer Rough Work Error
ANSWER :
D. t × sin(i - r) / cos(r)
17.
Total internal reflection occurs when:
A.
Light travels from a denser to a rarer medium and the angle of incidence exceeds the critical angle
B.
Light travels from a rarer to a denser medium at any angle
C.
Light is incident perpendicularly on a surface
D.
The two media have the same refractive index
😑 View Answer Rough Work Error
ANSWER :
A. Light travels from a denser to a rarer medium and the angle of incidence exceeds the critical angle
18.
The critical angle for a medium of refractive index √2 is:
A.
30°
B.
45°
C.
90°
D.
60°
😑 View Answer Rough Work Error
ANSWER :
B. 45°