33. Geometric Optics

You determine a concave mirror to have focal length . If you submerge the mirror in water ($n=1.33$), what would be the new focal length?

An object is placed in front of a concave mirror. If a real, enlarged image is formed even farther from the mirror than the object, which of the following is the most likely value for the focal length of the mirror? 

An object is placed from a concave mirror, producing a real image $15.0\(\operatorname{\mathrm{cm}\)}$ from the mirror. What is the focal length of the mirror?

A concave makeup mirror has a focal length of . What is the mirror’s radius of curvature?

Draw the principal-ray diagram for an object placed exactly at the focal point of a concave mirror. Where does the image form?

A person stands $20.0m$ in front of a large spherical mirror. A real image is formed $80.0\(\operatorname{\mathrm{m}\)}$ in front of the mirror. What is the magnification of this image?

For the following ray diagram, which ray is drawn incorrectly?