A 7·cm tall candle is placed 150·cm from a lens with a focal length of +50·cm. Note: all distances and heights should be strictly positive numbers... the type and orintation of each image is asked for separately.
(a) How far from the lens will the image be? cm.
(b) How tall will the image be? Cm
(c) Which of the following describes the image? Choose all that apply.
Real
virtual
Upright
Inverted



Now, imagine that the candle is moved closer, so that it is only 40·cm from the lens.
(d) How far from the lens will the image be? cm.
(e) How tall will the image be? Cm
(f) Which of the following describes the image? Choose all that apply.
Real
virtual
Upright
Inverted

What do you think the answers are? Which of your equations do you think applies?