A transparent block A having refractive index \mu=1.25 is surrounded by another medium of refractive index \mu=1.0 as shown in figure. A light ray is incident on the flat face of the block with incident angle \theta as shown in figure. What is the maximum value of \theta for which light suffers total internal reflection at the top surface of the block? [7 Apr 2025 Shift 2]

Correct Answer is : sin−1(3∕4)

Ray Optics and Optical Instruments Part 3

Section: Physics

Question : 23 of 56

Marks: +1, -0

A transparent block A having refractive index µ=1.25 is surrounded by another medium of refractive index µ=1.0 as shown in figure. A light ray is incident on the flat face of the block with incident angle θ as shown in figure. What is the maximum value of θ for which light suffers total internal reflection at the top surface of the block?

[7 Apr 2025 Shift 2]

sin‌−1(3∕4)
tan−1(4∕3)
cos−1(3∕4)
tan−1(3∕4)

Validate

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