Medium in which velocity of light remains constant is?

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Medium in which velocity of light remains constant is? Answer: Homogeneous

In a homogeneous medium, properties like density and refractive index are uniform light travels at a constant speed. In a heterogeneous medium, light slows down or speeds up as it passes through regions of different refractive indices.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.