Light - Lens Help

1. Mar 4, 2004

charng

I have two questions that i couldn't do, it aint that hard:

1.An object is placed 30.0cm from a convex lens of f=10.0cm. Find the position and the magnification of an image. (f = focal length)

An object is placed 20.0cm from a convex lens of f=30.0cm. Find the position and the magnifying factor of an image.

2. Mar 4, 2004

KLscilevothma

You can draw ray diagrams to help you, or use the lens formula (1/u + 1/v = 1/f) if you've learnt it.

3. Mar 4, 2004

HallsofIvy

Staff Emeritus
You also posted this in the "General Physics" section where I responded. Please do not multi-post!

4. Mar 4, 2004

Tom McCurdy

I attached the file with the answers....

This really isn't a problem that should require help... nor be in the college level help section. I am currenty in my junior year of high school and we are currently doing 4 and 5 mirror and lens combo problems.

The actual calculations are based upon 1/o+1/i=1/f
and Mag=-i/o

The final answers I belive came out to be I=15 cms M=1/2 x for problem one and I=-60 cm M=3x for problem 2

Last edited: Mar 4, 2004