PHYSICS
JAMB 2009 - Question 34
Physics 2009 JAMB Past Questions - Question 34: If the refractive index of crown glass is 1.51, its critical angle is
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
C
Explanation
The critical angle (θc) of a medium, in this case, crown glass, can be calculated using the formula:
θc = arcsin(1 / n)
Where:
θc = critical angle
n = refractive index of the medium
In this case, the refractive index (n) of crown glass is given as 1.51. Now, you can calculate the critical angle:
θc = arcsin(1 / 1.51)
θc ≈ arcsin(0.6623)
Using a calculator or a trigonometric table, you can find the inverse sine (arcsin) of 0.6623:
θc ≈ 41.4 degrees
So, the critical angle of crown glass with a refractive index of 1.51 is approximately 41.4 degrees.
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