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A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB (Fig. 9.4). When observed from the face AD, the pin shall 

(a) appear to be near A. 

(b) appear to be near D. 

(c) appear to be at the centre of AD. 

(d) not be seen at all.

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(d) not be seen at all.

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