1,271.
A.
18o
B.
34o
C.
45o
D.
68o
E.
90o.
Correct answer is B
No explanation has been provided for this answer.
1,272.
A.
1.65
B.
1.58
C.
1.52
D.
1.50
E.
1.48
Correct answer is E
No explanation has been provided for this answer.
1,273.
When a ray of light is incident normally on an air- glass interface, its angle of refraction is
A.
0o
B.
42o
C.
45o
D.
60o
E.
90o.
Correct answer is A
No explanation has been provided for this answer.
1,274.
A.
1.63
B.
1.50
C.
1.33
D.
1.25
E.
0.08
Correct answer is D
No explanation has been provided for this answer.
1,275.
A.
89.0ms-1
B.
6.0ms-1
C.
4.5ms-1
D.
1.5ms-1
E.
0.0ms-1
Correct answer is B
Velocity of image w.r.t boy = velocity of object - velocity of image
velocity w.r.t to boy = v - (-v)
=3.0 - (-3.0)
The image velocity is 6 m/s towards the boy.
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