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 $ .
