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JAMB Physics 2021 Paper
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© africaexams.com
Question : 38
Total: 40
The velocities of light in air and glass are 3.0 x 10
8
ms
−
1
and 2.0 x 10
8
ms
−
1
respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?
0.33
0.50
0.67
0.75
Validate
Solution:
\ sin i
\ sin r
=
velocity in air
velocity in glass
\ sin i
\ sin 30
=
3
×
10
8
2
×
10
8
Sin i =
3
4
= 0.75
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