Pre-Lab 7

Lab Time :							Name :


	1. Define (i) focal length,        (ii) object distance, 
	          (iii) image diatance,    (iv) magnification.		     (4)
















	2. What is the difference between a real image and a virtual image.  (2)











	3. For case (c) of sub-part 3, Part 1 of the procedure, what kind of
	   image ( real or virtual, inverted or upright, magnified or 
	   diminished ) do you expect to see ? 
	   ( Actually, it'll help to understand the lab really well if you do 
	     this for all the cases (a) through (e), but ........ )	     (4)