Question

You're going to watch videos on your phone but project them onto the wall to stimulate a big screen TV. Your phone screen is 8 cm tall but you want it to be projected onto a 2 m high section of wall. You have stolen lens with an f=10cm focal length.

a) did you get the right kind of lens?

b) calculate how far from the wall the lens should be, and how far from the lens the phone should be

d) will you need to play videos on your phone upside down?

Answer 1