JAMB - Physics (2009 - No. 23)
If the refractive index of crown glass is 1.51, its critical angle is?
48.6°
22.5°
41.5°
45.0°
คำอธิบาย
Sin c = (1)/n
= (1)/1.51 = 0.6622
∴ c = sin-\(^1\) 0.6622 = 41.47
= (1)/1.51 = 0.6622
∴ c = sin-\(^1\) 0.6622 = 41.47