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# physics unit 3 - real and virtual images? watch

1. ugh, can somebody explain in ENGLISH what it's all about.

okay so mirrors. Virtual images are not there because nobody is really behind the mirror, right? but what is a real image then? is real image on a lense but virtual on a mirror or something?

2. A virtual image is one that on a ray diagram appears to come from somewhere other than where the lines cross (for example, you don't really think in a plane mirror that they cross behind the mirror, do you?). But by definition, a virtual image cannot be projected onto a screen, whilst a real image can.
3. If the image is formed behind the mirror (from the huge "eye"'s perspective) then it's virtual
4. what's a real image then?
so confused.
5. A real image is one in which the image is formed (i.e. where the lines cross) in front of the mirror

I think that's all you need to know, none of the serious theory behind it
6. virtual is what our eyes think is real but not. I.e, nobody is standing behind the mirror when i look at it. Virtual are always left/right swapped and the same size as real thing.

real is enlarged and can be formed on a screen, right?
7. the best way to think if it is real/virtual, magnified/diminshed and upright/inverted is to sketch a little ray diagram and it will show you. or do it in your head. That is how i think of these questions.
8. a real image is an image that can be formed on a screen
a virtual image can't be formed on a screen (they are the basic definitions, but its obviously helps if you understand the ray diagrams as to WHY this is, but thats it basically)
9. (Original post by DreamGirlx)
a real image is an image that can be formed on a screen
a virtual image can't be formed on a screen (they are the basic definitions, but its obviously helps if you understand the ray diagrams as to WHY this is, but thats it basically)
Yeah, in an exam that's the exact definition they are looking for, can be formed on a screen
10. look at the other thread on ray diagrams for help here: http://www.thestudentroom.co.uk/showthread.php?t=601408
11. OK.
Isn't a real image, an image that has been made using a lens, then a virtual image is a magnification of the real image, using a lens with more strongly curved surfaces. Correct me if I'm wrong
12. if they ask u for the difference between a real image and a virtual image, basically all u have to say is.....
a virtual image can be projected onto a screen, but a real image can't.
if they ask u for the difference between a real image and a virtual image, basically all u have to say is.....
a virtual image can be projected onto a screen, but a real image can't.
I'm sure a real image can.
if they ask u for the difference between a real image and a virtual image, basically all u have to say is.....
a virtual image can be projected onto a screen, but a real image can't.
Other way around.
15. (Original post by piece_by_piece)
Other way around.
arghh yeh i'm wrong! i honestly didn't mean to write that though!
arghh yeh i'm wrong! i honestly didn't mean to write that though!
Haha, it's fine, everyone makes mistakes. We just didn't want you to get it wrong tomorrow!
17. (Original post by piece_by_piece)
Haha, it's fine, everyone makes mistakes. We just didn't want you to get it wrong tomorrow!
lol my exam's not until wednesday! is urs tomorrow?
18. Whoops, I meant Wednesday! I'm so tired, my brain won't function
19. lol! u made me panic for a bit! i actually had to go downstairs into the kitchen to check my timetable!

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