Ray Optics and Optical Instruments Part 3

Section: Physics

Question : 11 of 56

Marks: +1, -0

A prism of angle 75∘ and refractive index √3 is coated with thin film of refractive index 1.5 only at the back exit surface. To have total internal reflection at the back exit surface the incident angle must be ____ (sin‌15∘=0.25. and sin‌25∘=0.43)

[23 jan 2026 Shift 2]

between 15∘ and 20∘
15∘
<15∘
>25∘

Validate

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