Posted by **fatma** on Saturday, July 21, 2012 at 3:49am.

If a student desires to produce three times larger and an erect image from a double convex lens with focal length of 15 cm ,then he should place the object from the lens at ;

- Physica -
**Elena**, Saturday, July 21, 2012 at 9:58am
The object has to be placed between the lens and the focus.

di= distance between the image and the lens;

do=distance between the object and the lens;

F =focal length.

do/di=h/H=1/3 =>

3•do=di

1/F =1/do-1/di,

1/F= =

=2/3•do,

do=2F/3 =2•0.15/3=0.1 m.

## Answer This Question

## Related Questions

- Physica - If a student desires to produce three times larger and an erect image ...
- physical - If a student desires to produce three times larger and an erect image...
- physics - Because a concave lens cannot form a real image of a real object, it ...
- physics - A convex lens is needed to produce an image that is 0.70 times the ...
- physics - A convex lens is needed to produce an image that is 0.55 times the ...
- CALCULUS - If you could give an explenation with the answers, that'd be ...
- calculus problem - the thin lens equation in physics is 1/s+1/S=1/f where s is ...
- Physics: Lenses - 1) A convex lens with a focal lenght of 4.0cm is placed 20.0cm...
- physics - A box is placed 50 cm away from a double convex lens. The image is on...
- Science Important - 1. A toy of height 18.4 cm is balanced in front of a ...

More Related Questions