Question1

A concave mirror is made by coating the inner surface of a segment of a spherical shell with a reflecting material. An object with height 1.5 cm is placed on the axis and at a distance of 13 cm from the center of this mirror. The image of this object is inverted and has a height of magnitude 2.5 cm.

If object is now moved along the axis to a great distance (essentially an infinite distance) from the mirror, where is the image now produced?

Question2

Find out the potential inside and outside a uniformly charged solid sphere whose radius R and whose total change is q using infinite as reference point. Calculate the gradient of V in each region and check that it yields the correct field. Draw V(r)