waec model questions vol1 2024 physics
Objective • Question 1
Question 1
WAEC_MODEL_QUESTIONS_VOL1
•
2024
A beam of light passes from air into a glass medium with a refractive index of 1.5. If the angle of incidence in air is 30 degrees, calculate the angle of refraction in the glass. Then, determine the critical angle for total internal reflection at the air-glass interface.
Answer Options
A.
20.5 degrees for angle of refraction; 45.0 degrees for critical angle.
B.
21.0 degrees for angle of refraction; 43.2 degrees for critical angle.
C.
18.3 degrees for angle of refraction; 39.5 degrees for critical angle.
Correct Answer
D.
19.1 degrees for angle of refraction; 41.8 degrees for critical angle.
Correct Answer
D
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