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

A. appears to be near A.
B. appears to be near D.
C. appears to be at the center of AD.
D. not be seen at all.

Answers (1)

Hence, the correct answer is option (a,d)

Explanation:-

As given in the figure

 Because till the angle of incidence is less than the critical angle, i.e. incident angle on AD of the ray from the pin, a pin will always seem nearer to point A.

But when the angle of the incident is larger than the critical angle, the light undergoes total internal reflection and is not visible through AD.

Posted by

infoexpert23

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