One side of an equilateral prism is painted by a transparent material of refractive index n₂. The refractive index of prism is 1.6. The minimum value of n₂ required for total internal reflection from painted face is _ _ _.

Optics: JEE Main 2026 Physics question

JEE Main 2026 · 2 Apr, Evening shift · Q41

JEE Main 20262 Apr, Evening shiftPhysicsMediumOptics190× since 2002

One side of an equilateral prism is painted by a transparent material of refractive index

n_2

. The refractive index of prism is 1.6. The minimum value of

n_2

required for total internal reflection from painted face is ______.

JEE Main 2026 · 2 Apr, Evening shift · Q41

JEE Main 20262 Apr, Evening shiftPhysicsMediumOptics190× since 2002

One side of an equilateral prism is painted by a transparent material of refractive index

n_2

. The refractive index of prism is 1.6. The minimum value of

n_2

required for total internal reflection from painted face is ______.