Question

6. Describe and explain one method for finding the focal length of a converging lens.

7. What type of lens would be most effective in starting a fire using light from the sun? Explain how this is done. Where is the object located in this situation and where will the image be formed?

8. In a movie theater, the projector must enlarge a relatively small image on the film to fill up the large screen at a large distance away.

a)What type of image is seen on the screen (real or virtual)?

b)What must be the relative location of the film with respect to the lens?

c)What must be the direction (upright or inverted) of the film in the projector with respect to the image on the screen?

Describe as much as you can about the image when the object distance is:

a. d_o > 2 f

b)d_o = 2 f

c)f < d_o < 2 f

d)d_o = f

e)d_o < f

Answer 1