1. Consider a ray of light passing through a material with index of refraction n₁to another material with a flat surface and index of refraction n₂. The incident angle is ₁and the refracted angle is ₂.

The ray of light then passes back through to the first material via another flat surface. The refracted angle is ₃.

What is ₃ in terms of ₁? When a ray of light passes from one material to another and back to the same material, do you need to know the indices of refraction?

(hint: take a look at the example problems in chapter 34).

1. What is the focal length of a flint glass converging lens with radii of curvature 4cm and 5cm
2. The lens from question 2 is used to produce the image of an object 0.9meters in front of the lens.
3. At what distance from the lens is the object's image?
4. Is the image in front of or behind the lens?
5. What is the lateral magnification in this situation?