MP4-9, determine and report asf: , the expected focal length and the uncertainty in the focal length of this combi- nation of lenses used . In liquid lens experiment a concave lens is placed on a plane mirror. 3. It is the excellent combination of short, medium, and long telephoto focal length in one lens with a fast constant aperture imparting me with creating so many options. When two thin lenses, of focal lengths f 1 and f2, are put close together, the combination acts like a single lens of focal length f, given by 1 f 1 f 1 1 f 2 (4) In Equation 4, all focal lengths are signed quantities. Observations. Ans: Following is the table explaining the difference between the convex lens and the concave lens: Convex lens. The distance from the lens to that point is the principal focal length f of the lens. Let f1 , f2 and f3 be three focal lengths of the lenses. Focal Length of Lenses PHY 201 & 231 Lab PDF 1 Lab PDF 2. PDF Experiment 6 Optics: Focal Length of A Lens Lab 5 (lenses) - Richard Youngworth lab. - StuDocu combination of convex and concave lens. If an object is placed at 30 cm from the mirror, then find the image distance. The mathematics can be simplified by taking. Where f is the focal length, do is the distance between the object and the lens, and di is the distance between the image and the lens. Length of the index needle as measured by the scale, s = … cm. The focal length of the combination is. A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. PDF To Measure the Focal Length of a Convex Lens - Lawless Teaching To find focal length of a concave lens using a convex lens. Then using the formula. Take a few drops of transparent liquid on the plane mirror and put a convex mirror over it. A match is held a distance s_0 = 13.7 cm to . Students use a precision optics bench and several lenses alone and in combination to form real and virtual images. Place the object needle O at a distance greater than f 1 and remove parallax between the tip of O and its real inverted image by lens-mirror combination, by adjusting the position . 008 Physics 72.1 Lab Experiment Image Formation.pdf