Posted: September 13th, 2015

. A 5 cm (diameter) coin is positioned 20 cm away from a convex mirror that has a focal length of -15 cm.

. A 5 cm (diameter) coin is positioned 20 cm away from a convex mirror that has a focal length of -15 cm. What is the diameter of the image? 2. Consider that a lens has a focal length of +10 cm. If the object (a light source) is 20 cm from the lens at which distance will the corresponding image will be formed? 3. What is the focal length of a biconvex lens which has R1=12 cm, R2=-18 cm and an index of refraction of 1.44? 4. You have a convex mirror with a focal length of -10 m. What will the magnification of an object be if the object is placed at 15 m from the mirror?