A rectangular block of glass \( \mathrm{ABCD} \) has a refractive i...

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A rectangular block of glass \( \mathrm{ABCD} \) has a refractive index 1.6. A pin is placed midway on the face \( \mathrm{AB} \) (Fig.. When observed from the face \( \mathrm{AD} \), the pin shall
(a) appear to be near A.
(b) appear to be near \( \mathrm{D} \).
(c) appear to be at the centre of AD.
(d) not be seen at all.
\( \mathrm{P} \)
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