Optics Question 783

Question: A glass slab of thickness 3 cm and refractive index 3/2 is placed on ink mark on a piece of paper. For a person looking at the mark at a distance 5.0 cm above it, the distance of the mark will appear to be

[Kerala PMT 2005]

Options:

A) 3.0 cm

B) 4.0 cm

C) 4.5 cm

D) 5.0 cm

Show Answer

Answer:

Correct Answer: B

Solution:

The apparent depth of ink mark $ =\frac{realdepth}{\mu } $

$ =\frac{3}{3/2}=2cm $ .

Thus person views mark at a distance $ =2+2=4cm $ .



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