What is the critical angle for a glass medium (n = 1.5) when light travels from

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Question: What is the critical angle for a glass medium (n = 1.5) when light travels from glass to air? (2020)

Options:

Correct Answer: 41.8 degrees

Exam Year: 2020

Solution:

Using the formula for critical angle: sin(c) = n2/n1, we find c = sin^(-1)(1/1.5) ≈ 41.8 degrees.

What is the critical angle for a glass medium (n = 1.5) when light travels from glass to air? (2020)

What is the critical angle for a glass medium (n = 1.5) when light travels from glass to air? (2020)

Step 1: Understand that the critical angle is the angle of incidence above which light cannot pass through a boundary and is instead reflected back.
Step 2: Identify the refractive indices: n1 is the refractive index of glass (1.5) and n2 is the refractive index of air (approximately 1.0).
Step 3: Use the formula for critical angle: sin(c) = n2/n1.
Step 4: Substitute the values into the formula: sin(c) = 1.0 / 1.5.
Step 5: Calculate the value: sin(c) = 0.6667.
Step 6: Find the critical angle by taking the inverse sine: c = sin^(-1)(0.6667).
Step 7: Use a calculator to find c, which is approximately 41.8 degrees.

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