Two light rays \( \mathrm{P} \) and \( \mathrm{Q} \) are incident on an optical device \( X \) ...

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Two light rays \( \mathrm{P} \) and \( \mathrm{Q} \) are incident on an optical device \( X \) which finally goes along \( R \) and \( S \) . Identify optical device \( \mathrm{X} \) .
[NTSE 2017]
a. Concave lens
b. Concave mirror
c. Convex lens
d. Convex mirror
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