Consider three media P, Q and R with refractive indices 1, 1.25, and… | NEET 2026 (Re-neet)

Q8NEET 2026 · RE-NEETMedium

Refraction, Glass Slab & Apparent Depth

Consider three media $P, Q$ and $R$ with refractive indices $1, 1.25$ , and 1.5 respectively. The medium $Q$ having a thickness of 5 cm is placed between extended media $P$ and $R$ as shown in the figure. An object $O$ is placed at the centre of medium $Q$ . If viewed from medium $P$ near the normal direction, the apparent depth of $O$ is $h_1$ . For similar observation from medium $R$ , the apparent depth is $h_2$ . The value of $|h_1 - h_2|$ , in cm, is:

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Answer: (c)

$O$ is at the centre, $2.5$ cm from each face of $Q$ .
Seen from $P$ : $h_1 = 2.5 \times \dfrac{n_P}{n_Q} = 2.5 \times \dfrac{1}{1.25} = 2$ cm.
Seen from $R$ : $h_2 = 2.5 \times \dfrac{n_R}{n_Q} = 2.5 \times \dfrac{1.5}{1.25} = 3$ cm.
$|h_1 - h_2| = 1$ cm, so the answer is (c).

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