Concave lens ray diagram

PROCEDURE:

I. Convex lens

A greater insight into the formation of images by refraction from spherical surfaces can be obtained by constructing the path of the light rays graphically.

Set the focal length of the concave lens to 3.0 cm.

Now select three different object locations within the constraints shown in the table below for given below for Procedures I(a), I(b), and I(c). For each image location select an object height and record it in the table below. You may need to select different heights for different image locations in order to get the image to fit on the simulation screen.

Use the above equations to calculate the object distance, image distance, image locations, image size and image orientation. Show your calculations in your lab report.

Using focal length of 3.0 cm, draw ray diagrams, to scale, for Procedures I (a), I(b) and I(c) showing (i) the position of the object O, (ii) Position of focal point, and (iii) the position of the image I. Show all 3 ray diagrams (Draw by hand to scale) in your lab report.

Complete the table below in the report: Indicate whether p, q, and M are (+) or (-)

Image

Procedure	Object position	p (cm)	q (cm)	h0 (cm)	hi (cm)	Orientation
I (a)	2f> p> f
I (b)	p > 2f
I (c)	p < f

Check your answers using Program: http://ophysics.com/l12.html

From the above table, calculate the following ratios:

	Image Distance / Object Distance	Image size/Object size	% Difference
I(a):
I(b):
I(c):

II. Concave lens

Repeat the entire process from part I for the convex lens (by dragging the point named " Focus' " to the right of the lens to turn the lens convex).

Again show all calculations and ray diagrams in your lab report and also complete the table below in the report and indicate whether p, q, and M are (+) or (-)

Still use a focal length of magnitude 3.0 cm, (but REMEMBER to put it into your equation as a negative three cm value since it's a convex lens).

Image

Procedure	Object position	p (cm)	q (cm)	h0 (cm)	hi (cm)	Orientation
II (a)	2f> p> f
II (b)	p > 2f
II (c)	p < f

Check your answers using Program: http://ophysics.com/l12.html

From the above table, calculate the following ratios:

	Image Distance / Object Distance	Image size/Object size	% Difference
II(a):
II(b):
II(c):

QUESTIONS:

Plot of (1/p) against (1/q). What is the significance of the X and Y intercepts?

A converging lens of 15 cm focal length is placed on an optical bench that is 120 cm long. An object is fixed at 0.0 cm and a screen is placed at 140.0 cm.

Measuring from the object end of the bench, determine two positions of the lens for which an image will be focused on the screen.

Find the magnification in each case.