1.) Both sides of a spherical shell are polished and can be used as mirrors. When an object is placed 50.0 cm in front of the convex side, the magnification is found to be 0.250. What is the image distance if the concave side is turned to face the object without moving the location of the object or shell?
cm.
2.) A lens of focal length 15.0 cm is used to create an image of the Full Moon. What is diameter of the image? The Moon's radius and average distance from Earth are 1.74× 106m and 3.85× 108 m, respectively.
mm.