Physics Image Formation by Lenses
Image Formation by Lenses
Objective: The objective of this lab is to create different images by using the converging and diverging lenses as both lenses project light.
Introduction:
A key formula when working with lenses is the Thin-Lens Equation:
Where f is the focal length of the lens, do is the object distance and di is the image distance. From the Thin-Lens Equation we are able to mathematically see and understand many interesting and valuable situations that arise when working with lenses. When the object is the same distance from the lens as the image, for instance, we can easily verify that the focal length must equal half the image (object) distance or if the object is very far away from the lens (at infinity) the focal length will equal the image distance, just to mention a few. Values of do, di, and f are positive when located on the side of the mirror or lens where the light actually travels. All this is measured on the principle axis. The distance in front of the lens is referred to as positive.
Calculations and Results:
Converging lens measured: di = 16.5 cm do = 22 cm
H = 2.5 cm (1 / 16.5) + (1 / 22) = 9.43 =f
Measured f recorded was 11.5
Percent error = (11.5/9.43)x100% =
Diverging lens measured: di = 4.5 cm do = 23cm ho = 2.5 cm hi = 1.2 cm
(1 / 4.5) + (1 / 23) = (1 / f) = 3.76
Discussion:
Lenses are common optical devices constructed of transparent material e.g. glass or plastic, which refract light in such a way that an image of the source of light is formed. Normally, one or both sides of the lens has a spherical curvature. When parallel light from a source impinges on a converging lens, the parallel rays are refracted so that all the light comes together at a focal point. The distance between the lens and the focal point is called the focal length of the lens. An imaginary line parallel to the light rays and through the center of
Objective: The objective of this lab is to create different images by using the converging and diverging lenses as both lenses project light.
Introduction:
A key formula when working with lenses is the Thin-Lens Equation:
Where f is the focal length of the lens, do is the object distance and di is the image distance. From the Thin-Lens Equation we are able to mathematically see and understand many interesting and valuable situations that arise when working with lenses. When the object is the same distance from the lens as the image, for instance, we can easily verify that the focal length must equal half the image (object) distance or if the object is very far away from the lens (at infinity) the focal length will equal the image distance, just to mention a few. Values of do, di, and f are positive when located on the side of the mirror or lens where the light actually travels. All this is measured on the principle axis. The distance in front of the lens is referred to as positive.
Calculations and Results:
Converging lens measured: di = 16.5 cm do = 22 cm
H = 2.5 cm (1 / 16.5) + (1 / 22) = 9.43 =f
Measured f recorded was 11.5
Percent error = (11.5/9.43)x100% =
Diverging lens measured: di = 4.5 cm do = 23cm ho = 2.5 cm hi = 1.2 cm
(1 / 4.5) + (1 / 23) = (1 / f) = 3.76
Discussion:
Lenses are common optical devices constructed of transparent material e.g. glass or plastic, which refract light in such a way that an image of the source of light is formed. Normally, one or both sides of the lens has a spherical curvature. When parallel light from a source impinges on a converging lens, the parallel rays are refracted so that all the light comes together at a focal point. The distance between the lens and the focal point is called the focal length of the lens. An imaginary line parallel to the light rays and through the center of