A glass block of height 5cm is kept in water the absolute refractive index of water is4/3. The refractive index of glass relative to water is 5/4. Distance to the image of object O from the water air boundary when it is viewed directly above.
Answers
Actually, ng = 3/5 and nw = 4/5.
Refractive Index of a medium = Speed of light in vacuum/Speed of light in the medium
=>Speed of light in the medium = Speed of light in vacuum / Refractive Index of a medium
Speed of Light in Vacuum = 3 x 108 m/s
Speed of light in glass = 3 x 108 / (3/5) =5 x 3 x 108 / 3 =5 x 108 m/s
Speed of light in water =3 x 108 / (4/5) =5 x 3 x 108 / 4 =3.75 x 108 m/s
Actually this is impossible,as speed of light in vaccum is maximum
I think in your question,refractive index of glass is 3/2 and that of water 4/3 [Then answer will change accordingly]
Answer:
Correct option is C)
RI=
apparent depth
real depth
Substituting,
3
4
=
apparentdepth
12
Therefore, apparent depth=
4
12×3
=9
The height by which it appears to be raised is 12−9=3cm