Quick Quiz 6

A camera can be modeled as a simple converging lens that focuses an image on the film, acting as the screen. A camera is initially focused on a distant object. To focus the image of an object close to the camera, the lens must be

(a)moved away from the film. (b)left where it is.

(c)moved toward the film.

Quick Quiz 7

Two campers wish to start a fire during the day. One camper is nearsighted and one is farsighted. Whose glasses should be used to focus the Sun’s rays onto some paper to start the fire? (a)either camper

(b)the nearsighted camper

(c) the farsighted camper.

Quick Quiz 8

A particular nearsighted person is unable to see objects clearly when they are beyond 2.5 m away (the far point of this particular eye). What should the focal length be in a lens prescribed to correct this problem?