Lab 7
		          Qusetions and comments .....

( Note : This is not a substitute for the lab manual but a supplement. )

	0. Assume that the uncertainty in measurement of the image distances 
	   was 3 cm. Calculate the uncertainty in the focal lenght and in the
	   magnification. (Do these uncertainty calculations only for the
	   136 mm lens.) When comparing the focal length calculated from you 
	   data with value given to you (136 mm.), how will you use this 
	   uncertainty ? 

	1. For each of the parts (a) through (e), in addtion to the 
	   measurements you make, mention whether the images were
	   inverted or upright, magnified or diminished, real or virtual.

	2. Mention all the above properties of the images for the mirror.
	   Here, you also should mention whether the image distance was more or 
	   less than the object distance.

	3. Show all the calculations for the microscope. While describing the
	   image for the microscope, make sure you note down all the properties 
	   of the image.