# Calculating refractive index using lens

1. Feb 21, 2012

### m~ray

we can calculate the refractive index of liquids like water using a converging lens and mirror by the standard method . r.index of water is less than that of lens(glass) . now taking mercury, whose r.index is > glass, can we do the same experiment and find its r.index ?
i believe the answer is no.. coz there the rays get diverged and hence no real image is formed. but i dont think it will always diverge ?? any in sight ?

2. Feb 21, 2012

### xts

Refractive index of mercury? It seems to be too opaque to have well defined refractive index (at least if you take r.i. in its classical meaning).

3. Feb 21, 2012

### m~ray

oh ya.. mercury is a bad example.. lets say any other transparent liquid having r index > that of glass.

4. Feb 21, 2012

### xts

So now I have no idea what do you mean by "standard method".
There are lots of methods to measure R.I. which may be used for liquids of both higher and lower R.I. than the one of glass.

5. Feb 21, 2012