waves - magnifying glasses Flashcards
1
Q
when does a magnifying glass work?
A
when an object is less than 1 focal lengths away
2
Q
what do we draw when lines don’t meet on a ray diagram?
A
draw dotted lines to extend the rays behind the lens (don’t represent actual path of rays)
where dotted lines meet show position of the image
3
Q
properties of image where focal length is less than 1 away from lens?
A
image is magnified (bigger), image same way up, image virtual (not real). cant see image on a screen
4
Q
when is the only time a convex lens produces a virtual image?
A
when it is used as a magnifying glass
5
Q
magnification equation
A
image height / object height
