Practical Applications of Converging Lenses: Object Positions and Uses

[blah:p]

Homework Statement

For each of the following object positions in front of a converging lens, suggest at least one practical application. (E.g. overhead projector, camera etc.)

a) Between the lens and F'
b) At F'
c) Between F' and 2F'
d) At 2F'
e) Beyond 2F'

The Attempt at a Solution

So far I've only found practical applications for the following, and I'm not 100% sure if they are correct.

b) Pair of Glasses
e) Binoculars

 

[blah:p]

anyone who can help?

 

[konthelion]

You have to ask what happens to the image in each scenario.

a) Between the lens and F' - The image is inverted and appears larger than the real object's height.
b) At F' - no image
c) Between F' and 2F' - inverted image x2 of object
d) At 2F' - inverted image
e) Beyond 2F' - inverted image smaller in size

 

[blah:p]

So based on that. I've concluded

a) telescope
b) no image-can't think how this would apply to practical application in real life.
c) microscope
d) again, can't seem to think how this would apply in real life
e) camera