Critical Angle Formula (Condition for Total Internal Reflection)
Formula: sin θ c = (n₂)/(n₁) (where n₁ > n₂ ) Applicable Conditions: Total internal reflection occurs when light travels from a denser medium (refractive index…
Syllabus path: Optics › Geometrical Optics › Law of Refraction
CSCA Exam Prep
This formula is aligned to the CSCA undergraduate admissions exam syllabus. Continue with the linked tutorial and topic practice.
Practice related questions (9) · Start mock exam · Sign up — AI explanations · Membership plans
CSCA Physics Formula Reference
Formula and explanation
Formula: sin θ c = (n₂)/(n₁) (where n₁ > n₂ ) Applicable Conditions: Total internal reflection occurs when light travels from a denser medium (refractive index n₁ ) to a rarer medium (refractive index n₂ ) and the angle of incidence is greater than or equal to the critical angle θ c. Explanation: When the angle of incidence equals the critical angle θ c, the angle of refraction is 90°. This is fundamental to fiber optic communication and many optical devices.
Related tutorial and examples
Law of Refraction
Topic: Optics > Geometrical Optics > Law of Refraction Law of Refraction (Snell's Law) 1. Conceptual Definition The phenomenon where the direction of light changes when it passes obliquely from one medium into another. It is the basis for lenses, mirages, and fiber optics. 2. Cor…
Plan your next CSCA study step
Use this topic in a focused practice set, then connect it to the exam requirements and timed papers.