A magician during a show makes a glass lens with n= 1.47 disappear in a trough of liquid . what is the refractive index of the liquid ? could the liquid be water ?
Answers
Question:
A magician during a show makes a glass lens with n=1.47 disappear in a trough of liquid. What is the refractive index of the liquid? Could the liquid be water?
Answer:
The refractive index of the liquid should be 1.47; only then we have not any refraction and light direction change.
It can not be water because:
If
Then
Hence the lens in the liquid will act like a plane sheet , when refractive index of the lens and the surrounding medium is the same.
Therefore
Hence the liquid medium is not water, Refractive index for water = 1.33
It can be glycerine or turpentine as both are "clear" liquid with refractive index equal to 1.47.
Given,
A magician during a show makes a glass lens with n= 1.47 disappear in a trough of liquid
To find,
Refractive index for the liquid
Could the liquid be watered
Solution,
A magician during a show makes a glass lens with n= 1.47 disappear in a trough of liquid
To make the lens disappear, the liquid's refractive index must be equal to 1.47. This means that n1=n2. 1/f=0or f -infinity is the result of this. The liquid lens will behave like a flat sheet of glass.
No, the liquid is not water, to be sure. Glycerine could be the answer.