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MODEL PAPER - 9 [2026] — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER - 9 [2026]1 Mark
Question
Assertion (A): As the temperature of a medium increases the refractive index decreases.
Reason (R): When a ray travels from a vacuum to a medium, then $\mu$ is known as the absolute refractive index of the medium. ( $\mu_{\text {vacuum }}=1$ ).
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Answer

(B) Both A and $R$ are true but $R$ is not the correct explanation of A.
Explanation: Both A and R are true but $R$ is not the correct explanation of $A$.

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