Optics Question 85
Question: One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is
[CPMT 1999]
Options:
0.4
0.8
1.2
1.6
Show Answer
Answer:
Correct Answer: C
Solution:
Let x be the apparent position of the silvered surface.
According to property of plane mirror x + 8 = 12 + 6 + x
$ \Rightarrow $ x = 5 cm
Also $ \mu =\frac{x}{t} $
$ \Rightarrow $ $ \mu =\frac{6}{5}=1.2 $
BETA
