1. A concave (converging) mirror is made out of a section of a spherical surface with radius = 2.95 m. If you look into this mirror with your face at a distance s = 1.75 m from the mirror's vertex (center), what is the magnification of your face's image in the mirror (key in a negative sign if the value is negative)?

2.In a photoelectric effect experiment, metal A with work function 5.47 eV absorbs monochromatic light and emits electrons that carry initial kinetic energy 2.77 eV. In another trial, metal B absorbs light with the same frequency but double intensity and emits electrons that carry initial kinetic energy 6.51 eV, what is the work function of metal B (in eV)?

3.A converging lens with focal length 0.295 m is used to project an image of a candle flame onto a screen that is set a distance 5.50 m from the lens. At what distance must the actual candle flame be from the lens to get an image on the screen (in meters)?