For all angles of incidence greater than the critical angle, the wave will undergo what is known as total internal reflection. Which of the following is the correct formula for the critical angle?
Correct Answer:
A.
Explanation:
The formula for the critical angle (?c) is derived from Snell's Law (n1 sin ?1 = n2 sin ?2). When the incident angle reaches the critical angle, the angle of refraction is exactly 90 degrees. Substituting ?1 = ?c and ?2 = 90° into the equation results in n1 sin ?c = n2 sin 90°. Since the sine of 90 degrees is 1, the formula simplifies to sin ?c = n2 / n1. Therefore, the critical angle can be calculated as ?c = arcsin(n2 / n1), where n1 is the refractive index of the denser medium and n2 is the refractive index of the less dense medium.
Click below to open Discussion & Feedback
0 Issues
Please
login to comment or Report Issues.