This lab will let you examine the relationships between the focal length of the lens, the location and height of an object and the location and height of an image. Experiment 3 - geometrical optics image formation and focal length of a lens or measure the focal length of one of the unknown lenses supplied in the lab. 1 converging lens goal: to measure the focal length of a converging lens using various methods and to study how a converging lens forms a real image lab. Physics 425lw optics laboratory thin in this lab you will study thin lenses you will learn a variety of ways to determine the focal length of lenses and the.
Thin lenses physics 227 lab 1 introduction: from last week's lab, reflection and refraction, you should already be familiar with the following terms: principle axis, focal point, focal length,f, converging lens (f is +), and diverging lens (f is -. Conclusion: from the results of the lab we calculated the focal length of our converging lens to be 1901 cm after conducting the experiment seven times, and calculated the focal length for each we can. To the focal length, f, by the lens equation: 1/f = 1/ d o + 1/ d i (1) all the distances are measured from the center of the lens if the object is placed very far away from the lens (d o ≈ ∞) then 1 d o ffffff approaches zero ray diagram for an object infinitely far away from the lens in this case, d i = f this allows us to determine the focal length of a. Procedure to determine the focal length of the 150mm lens: remove the 75 mm lens and replace it with the 150 mm convex lens reset the screen to the 70cm mark. 1 experiment 6 optics: focal length of a lens the following website should be accessed before coming to class text reference: pp189-196 optics bench.
Pre-lab for lenses and mirrors eqn 1 to calculate the focal length of diverging lens change the position of the converging lens and repeat four more times. Focal length ( f ) object distance, do image distance, di magnification, m concave mirror convex mirror convex lens concave lens usually image real image virtual image upright image inverted + - + - + + - + - table 1: sign convention for spherical mirrors and lenses (b) spherical lenses the shape of biconvex and biconcave spherical lenses are. 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.
Real lab procedure: keep the given convex lens of known focal length, f1, in contact with the concave lens whose focal length to be determined this forms the combination of lenses it is placed between the illuminated wire gauze and the screen at a fixed distance away from the wire gauze it is taken as u cm. Basic telescope optics and exit through the eyepiece lens the focal length of the objective is f record the focal length f in your lab notebook. Physics 4 laboratory snell’s law, lenses help you to be prepared for a productive experience in lab what is meant by the focal length of a lens 8. The laboratory about tutorial » refraction and the ray model of light » the anatomy of a lens the mirror to the focal point is known as the focal length.
Thin lenses and optical instruments screen, 2 short focal length double convex lenses 1 long focal length double convex lens (l4), 1 double concave lens (l5). Focal length of convex lensb11 lab report objectives of the experiment: to determine the focal length of a spherical convex lens ♦ by “lens formula method” ♦ by “lens replacement method” to compare both methods theory: in this experiment, we have chosen two methods to find out the focal length of a spherical lens.
Physics 41- lab 5 determination of focal length of a converging lens and mirror objective: apply the thin-lens equation and the mirror equation to determine the focal length. Clamp a lens holder at approximately 75 cm height above the arrow and place a +6 cm-focal-length objective lens in holder clamp a 2nd lens holder at approximately 36 cm above the arrow and place a +13 cm-focal-length eyepiece lens in the holder.
Lab 3: lenses 1 introduction refer to appendix d for photos of the appara-tus in this lab, you will investigate diﬁerent methods of ﬂnding the focal length of a convex lens. A converging lens of focal length 25 cm a bug is 8 mm long and placed 15 cm from the lens what is the size of the image f f p = 15 cm q = -375 cm ' ( 375 cm) 8 mm 15 cm y y’= +20 mm the fact that y’is positive means that the image is erect it is also larger than object the fact that y’is positive means that the image is erect. Determine the focal length of the diverging lens by combining it with the converging lens set d0 to at least 12 cm and then obtain and record di for the image produced by the combination of lenses calculate the focal length of the combination of lens, fc , in the same manner as in step 3 of part i. Why you should know what focal length means knowing what the focal length means, especially in relation to your camera, is very important when it comes to buying lenses.