Consider an isosceles trapezoid of material of refractive index √2 and dimensions of sides being 5 cm, 5 cm, 10 cm and 5 cm. The angle of minimum deviation by this arrangement when light is incident from air and emerges in air is

Question

G1 Physics · Accepted Answer

Derived solution: Step 1: For a prism use r₁ + r₂ = A and δ = i + e - A. At minimum deviation i = e and r₁ = r₂ = A/2, so μ = sin[(A + δₘ)/2]/sin(A/2). Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is 30°. Therefore the correct option is B.