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Converging and Diverging Lenses
The thin lens equation is as for curved mirrors.
The equation for magnification is:
Convex lenses can produce real images if the object is placed outside the focal point or virtual
images if the object is inside the focal point. Concave lenses always produce virtual images.
With lenses the object distance, do, is positive if the object is in front of the lens and negative if it
is in back of the lens. The image distance, di, is positive if the image is in back of the lens and
negative if it is in front of the lens. In other words, if the rays from the object pass through the
lens and converge, the object and image will be on opposite sides of the lens, do and di will have
the same sign, and the image will be real. If the rays from the object diverge, the object and
image will be on the same side of the lens, do and di will have opposite signs, and the image will
Procedure and Data
Access the simulation using the following web link
Select Simulations on the menu bar and then select Physics. Select the
Geometric Optics lab and then select the arrow in the middle to
launch. Select the Lens once the lab has launched.
Select the Principle rays (bottom menu) and Ruler (You will physically move the ruler to the
simulation). Click on the â€œchange objectâ€ until you see an pencil as the object.
Note down the following parameters:
The horizontal axis through the center of the lens is called the principle axis. The pencil on the
left hand side is your object and the image is appearing on the right hand side. Move the Object
(pencil), so the eraser of the pencil lay on to the principle axis.
The â€œXâ€s on the principle axis represents the focal point of the lens. The distance from lens to the
focal point is called the focal length (f). The focal length is equal in either side of the lens.
Measure the focal length using the ruler tool
Focal length (f):â€¦â€¦â€¦â€¦â€¦â€¦â€¦.
Calculate 1/f :â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦..
The distance between the object and the lens is called the object distance (d0) and the distance
between the lens and the image is called the image distance (di). Set the object distance to the given
values in the table below, and record the image distance. And do the appropriate calculations to