A ray of light passes through equilateral prism such that the angle of incidence is equal to angle of emergence and each of these angles is equal to \(\left(\frac{3}{4}\right)^{\mathrm{th}}\) the angle of prism. The angle of deviation is

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.