JAMB - Physics (2025 - No. 25)
If the critical angle for a glass–air boundary is 45º, what is the refractive index of the glass?
\(\sqrt{2}\)
\(\sqrt{5}\)
\(\sqrt{3}\)
2\(\sqrt{2}\)
Selitys
Answer: A
n = \(\frac{1}{\text{sinC}}\) = \(\frac{1}{sin45º}\) = \(\sqrt{2}\).