# Object magnification after Convex surface

1. Dec 9, 2005

### dimensionless

I have an object that is surrounded by air and sits a distance U=30 from a convex surface. The convex surface has a radius of R=5. The index of refraction of the refracting media is n=1.33. How do I determine the magnification of the object?

2. Dec 10, 2005

### siddharth

I think, if you find out where the object falls after refraction using the lens maker forumla($R_2 = \infty$), you can calculate the magnification using some simple geometry
http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/lenmak.html" [Broken]

Last edited by a moderator: May 2, 2017
3. Dec 10, 2005

### dimensionless

It is not a thin lense. It is a convex interface between two materials.

4. Dec 10, 2005

### siddharth

My mistake then.
The general equation of refraction at a spherical surface will be

[tex] \frac{\mu_2}{v} - \frac{\mu_1}{u}=\frac{\mu_2 - \mu_1}{R} [/itex]