1.A candle isplaced 2.5f in front of a converging lens. Where will the image ofthe candle appear? What kind of image is it? (select twoanswers) (a) within f of the lens (j) image is real (b) between f and 2f from the lens (k) image is virtual (c) greater than 2f from the lens
2.A certain thin lens has a focal length f. If you halved both ofits radii of curvature, but change nothing else, its focal lengthwill now be (Show calculation)
(a) 4f
(b) 2f
(c) f
(d) f/2
3. The figure depicts a concave spherical mirror whose center ofcurvature is point C. Where should a point source of light (like atiny LED) be located if its reflected light is to emerge parallelto the central axis?