Focal length of lenses objective: to measure the focal length of convex (positive or convergent) lenses and concave (negative or divergent) lenses theory: a lens is a transparent object with two refracting surfaces whose central axes coincide. Positive focal length, in which case it brings parallel light rays together at a common point, or a negative focal length, which causes parallel light rays to appear to diverge from a common point either kind of lens can form real or virtual images from real or virtual objects. Lab 11 – lenses page 1 lab 11 - lenses last edited september 20, 2018 calculate and record in your lab records both the focal length b between the focal length and twice the focal length, c greater than twice the focal length, and d at the focal length. Title: finding the focal length of a lens using the ray box target group: diploma in basic education cognitive skills (cs) cs1 explain how the focal length of various lenses can be determined cs2 explain with diagrams the various properties of the types of lenses 3. Lab 4: thin lens combinations 1 read the following section about lens combinations two cases are presented for convex lenses a) lenses separated by less than the focal length of either lens.

Home lab 9 ‐ lenses, lens equation, and simulations name_____ date_____ 3 this is a very good approximation of the focal length of lens 2. To determine the equivalent focal length of two joined lenses using their individual focal lengths 3 to measure the focal length of diverging lens by combining it with a converging lens and forming a real image. Physics 41: image formation by converging lenses & mirrors objective: apply the thin-lens equation and the mirror equation to determine the focal length of a converging lens and mirror apparatus: biconvex glass lens, spherical concave mirror, meter ruler, optical bench, lens holder, self-illuminated object (generally a vertical arrow), screen.

Geometric optics 205 - phet interactive simulations. Lab 6 thin lenses objectives 1 explore the difference between converging and diverging lenses and determine their focal lengths 2 determine the focal length of a diverging lens using the lensmaker’s equation 3 experimentally measure the image distance and con firm the thin lens equation 4. Watch how the image changes when you adjust the focal length of the lens, move the object, move the lens, or move the screen sample learning goals explain how an image is formed by a converging lens using ray diagrams.

In this experiment, you’ll determine the focal length of a lens by studying the relationship between an object and its image an example of the setup is shown in fig. Focal length of a lens lab summary use a basic optics kit to determine the unknown focal length of a converging lens (spherical) theory given a converging lens (spherical) with unknown focal length, experimentally determine a value for the correct focal length of this lens. Astr 1030 astronomy lab 97 optics - lenses & telescopes optics — lenses and telescopes synopsis: in this lab you will explore the fundamental properties of a lens and investigate the value f in the formula is the focal length, the distance from the lens to the focal point. 130 experiment 22: thin lenses part 2: diverging lens to determine the focal length of a diverging lens, the lens must create a measurable, real image as in part 1 however, light cannot be focused through.

Includes an objective lens of 420 mm focal length and an ocular lens of 30 mm focal length a pair of telescoping cardboard tubes and xtures to allow you to mount lenses in each end to make a. C wenowhavetoask:wheredotheraysreallygowhentheyhitlens2we knowparallelraysthathitlens2willgoawayfromthefocalpointoflens2. Pre+labforlenses andmirrors 78 use this to find focal length of the lens and compare the result to the known value spherical mirrors and lenses 84 b concave mirror 2 place the light source at one end of optical bench place the mirror 50 cm away from lab 14 lenses and mirrors author.

Focal length of lenses 3 20 30 10 0 lens d sag (b) l (a) {figure 1: (a) the top view of a spherometer (b)speherometr on a convex lens the ﬁgure shows the deﬁnition of l, and sagittal distance dsag screw at the lens’ center. During the course of the lab, were you able to form another type of image with the 10cm and 20cm focal length double convex lenses if so, how yes, by bringing the double convex lenses closer to the light source, another type of image was formed which is the virtual image. General science 1110l lab lab 7: convex lens objective: to investigate the image formed by a certain thin convex lens and to determine its focal length.

- Objectives: verify lens equation determine focal length of a lens or combination of lenses pre lab: write down the thin lens equation and give the approximations made to obtain it.
- Measure the focal length of one concave lenses doing so is a bit more complicated than for a convex lens since it is a diverging lens and hence has a negative focal length.

You can calculate the focal length (f) of combination of lenses using the formula f = uv/(u+v) the focal length of convex lens (f 1 ) is shown inside the simulator window you can calculate the focal length of the concave lens using the formula f 2 = (f 1 f/(f 1 -f. Fixed focal length lenses a fixed focal length lens, also known as a conventional or entocentric lens, is a lens with a fixed angular field of view (afov. Chapter 10 thin lenses name: lab partner: section: 101 purpose in this experiment, the formation of images by concave and convex lenses will be explored focal length of the lens an imaginary line parallel to the light rays and through the center of the lens is called the principal axis see figure 101.

Focal length of lenses lab

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