question_answer

A mark is made on a drawing sheet. A glass slab of thickness \[t\] and the refractive index \[\mu \] is placed over the sheet. The mark appear to be raised by :

A)  \[\frac{t}{1-\mu }\]                       

B)  \[\left( 1-\frac{1}{\mu } \right)t\]

C)  \[\left( 1-\frac{1}{\mu } \right)t\]                           

D)  \[\frac{\mu }{t}\]