Minimum Deviation — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Minimum Deviation.

Direct application of refractive index formula

high

This is the most fundamental aspect of minimum deviation and directly tests the student's ability to apply the core formula $n = \frac{\sin\left(\frac{A+D_m}{2}\right)}{\sin\left(\frac{A}{2}\right)}$. These questions are straightforward if the formula is known and trigonometric values are remembered. They are easy to frame and provide a clear assessment of basic understanding and calculation skills, making them a consistent choice for NEET.

Conceptual questions on conditions for minimum deviation

medium

NEET often includes conceptual questions to test deeper understanding beyond mere formula memorization. Questions about $i=e$, $r_1=r_2$, or the ray being parallel to the base (for symmetric prisms) are common. These questions assess whether a student truly understands the physical phenomenon rather than just plugging values into a formula. They might also involve interpreting the D vs i graph.

Problems involving thin prism approximation

medium

The thin prism approximation $D_m = (n-1)A$ is a simplified yet important case. It tests the student's knowledge of approximations and their applicability. These problems are often quicker to solve and can be used to check if a student knows when to apply the simplified formula versus the general one. It's a distinct sub-topic within minimum deviation that is frequently tested.