Lenses

Lenses:

In this lab we will be covering lenses and how it converging and diverging lenses affect light in different ways.

The focal length of the lens we are usin gis 20cm

At 4 focal lengths, the distance, d0, is 80cm

the di = 25cm

the height of the filament, h0 = 8.8cm

the height of the image, hi = 3.5cm

the magnification, M is the image height divided by the object height. This is the same definition that was use din part two in the study of mirrors. M = 3.5/8.8, .397

the image is real and inverted.

We reverse the lens, all of the measurements are the same. the image is again, real, inverted.

Moving the lens two focal distances from the filament. we record the following measurements:

d0=40cm

h0=8.8cm

di=37cm

hi=8.5cm

M=8.5/8.8= .97

the image is real, inverted.

we reverse the lens, all of the measurements are the same. the image is again, real, inverted.

we move the lens to 1.5 focal length.

d0=30

di=50

h0=8.8

hi=14.5

m=14.5/8.8=1.65

when half the lens is covered, the image is lessened in intensity.

The focal length of the lens, using a distance object: 20. they are the same.

varying the position of the object, lens, and the image:

we make the following measurements:

5f:

di=24, h=0=8.8, hi=2.5

3f:

di=28, h0=8.8, hi=4.5

when the object distance is changed to .5f, there is no image found.

the image is imaginary and non inverted.