Concave Lens Ray Diagram Activity#4 (C)Name ______
Finding the Image Produced by a Concave Lens
Part 1: Use the 3 rays from the Graphical Method to find the image. Use a point at the top of the figure’s head as your starting point for each ray.
Hint: Think about how a concave lens will affect the path of light that travels through it. In this case, light rays are sometimes drawn as if they are coming from the focal point and not through the focal point.
Use the intersection of these 3 rays to find and draw the location, size and orientation of the figure’s image. Then measure and record the following in cm:
do = ______di = ______f = ______ho = ______hi = ______
Why are the image distance and the focal length both negative for this lens?
Calculate the magnification both ways and compare them below. Describe the meaning of this magnification in a sentence.
Part 2: Now, repeat the same steps as above using the Graphical Method to find the image below.
Measure and record the following in cm:
do = ______di = ______f = ______ho = ______hi = ______
Calculate the magnification of this image both ways. Explain its meaning in a sentence.
In what ways is this image different from the first diagram? In what ways is it similar?
Part 3: Use the Graphical Method to find the location, size and magnification of the image. Describe your results below the diagram.
Measure and record the following in cm:
do = ______di = ______f = ______ho = ______hi = ______
Calculate the magnification of this image both ways. Explain its meaning in a sentence.
In what ways is this image different from the first two diagrams? In what ways is it similar?
Part 4: Before drawing anything, write a sentence predicting the size, location and magnification of the image for the following ray diagram.
______
______
Now use the Graphical Method to find the image and compare it to your prediction.
What do all the images formed using concave lenses have in common?