The velocities of light in air and glass are 3.0 x10\(^8\)ms\(^{-1}\) and 1.8 \(\times \)10\(^8\) ms\(^{-1}\) respectively. Calculate the sine of the angle of incidence that will produce an angle of refraction of 30° for a ray of light incident on glass.
1.2
1.0
0.8
0.6
0.3
Explanation
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Discussions (11)
Refractive Index(n)= sin i/ sinr = vel.of light in air/vel. of light in glass
sini/sin30 = 3×10⁸/1.8×10⁸
remember sin 30 = 0.5
therefore, sini= 1.667×0.5
sin i= 0.83~ 0.8
ANSWER IS = C
Va = 3x10 mis
Vg = 1.8 x 108m1s
ì = ? r = 30°
8 u = Va = 3x10° =1.67
Vg 1.8×108
M = sini sinr
1.67 * sini
sin 30
Sini= 1.67X Sin 30
Sini 0.8333/
explanation is not available for number 25 because the teachers in my school haven't taught me the topic and besides I am not in SS3 class also l have to learn it
