Consider the setup below. The convex lens has a focal length of 2.75cm. Using ray-tracing techniques and a ruler, find the location of the image on the other side of the lens. Using a ruler, measure the height of the image compared to the height of the object. 1. 2. Object at 2F F
Consider the setup below. The convex lens has a focal length of 2.75cm. Using ray-tracing techniques and a ruler, find the location of the image on the other side of the lens. Using a ruler, measure the height of the image compared to the height of the object. 1. 2. Object at 2F F
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PHY 206 LAB Ray Trac...
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Purpose
The purpose of this activity is to use the 3 special rays to determine the images created by lenses.
Introduction
The purpose of ray tracing is to create a geometrical viewpoint of the creation of an optical image using
the principles of ray (geometrical) optics. If done to scale, we can determine the properties of the image
(size, position, real or virtual, etc.) created by different optical elements. While all rays from a given point
on an object are focused by a lens to a unique point on the image, there are special rays whose properties
are easy to remember and draw. For lenses, there are three special rays:
a. A ray initially parallel to the axis refracts through the far focal point.
b. A ray that enters the lens along a line through the near focal point emerges parallel to the axis.
c. A ray through the center of the lens does not bend.
Draw the object as an arrow
with its base on the axis.
Draw the three special rays from the tip of the arrow.
a. Parallel to the axis
25 cm
Lay out the optical axis, with a scale
2. Object at 2F
AA
3= 200 cm
F
b. Through the near focal point
Through the center of the lem
F
3. Object located between F and 2F
The rays refract at the lens plane.
Measure the image distance.
Draw the leas and lens plane
and mark the focal points.
In this activity, the properties of images created by both converging and diverging lenses are investigated.
Part I - Bi-Convex Lenses (Converging Lenses):
Q
Consider the setup below. The convex lens has a focal length of 2.75cm. Using ray-tracing techniques and
a ruler, find the location of the image on the other side of the lens. Using a ruler, measure the height of the
image compared to the height of the object.
1.
... 56
f
F
The convergence point is
the tip of the image. Draw
the rest of the image.
outlook.office.com
B
...
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