The lens equation has been proved and it can be concluded that there is a specific property of lenses that is applicable in getting the focal length. Here µ is refractive index of lens material to the medium outside. According to the author, this method gives the focal length value with less than 1% accuracy. The lenses are touching. 2. 7. If two lenses of fecal lengths f 1 and f 2 are kept in contact, the focal length F of the combination is given by. This is lens maker’s formula. The focal lengths of each lens is significantly larger than the distance between the lenses. Before getting started with the experiment, it is important to understand a few terms that are used in a concave mirror and convex lens: Centre of curvature: For a curved mirror, the centre of curvature, C can be defined as the centre of a hollow glass sphere of which a curved mirror is a part. This property is the reversibility property of thin lenses. Find the theoretical value of the focal length for this combination of lenses. 3. Combined focal length (F): =f 1 f 2 /[f 1 + f 2] F = 10x(-20)/[10-20] = +20 cm The focal length of the combination is positive and so it acts as a convex lens. 1/F = 1/f 1 + 1/f 2. Experiment: Determine the focal length of a concave lens by combining it with a suitable convex lens. Mount the 2 lenses next to one another. Combination of Thin Lenses. Last problem on study guide help! A combination of convex and concave lenses has power 4 D.If the convex lens has power 5 D focal length of the concave lense will be View Answer A bi-convex lens is formed with two thin plano-convex lenses as shown in the figure. Determine the effective focal length of a combination of two converging lenses arranged as shown below: 1. HYPOTHESIS: The relationship between u and v and the focal length f for a convex lens is given by .Where f is the focal length, u is the distance between the object and the lens v is the distance between the image and the lens. Goal:!!To!determine!the!focal!length!of!a!concave!lens!and!to!better!understand!how! Concave(Lensesand(LensCombinations(! Consider two thin convex lenses L 1 and L 2 of focal length f 1 and F 2 placed coaxially in contact with each other. The combined focal length for two thin lenses separated by a distance a (Figure 2) is given by the equation: Part C: Combinations of lenses. So, focal length of a lens increases when it is immersed in water. Conclusion The objective of this experiment is to determine the focal length of a convex lens using different locations of the object and graphical method. Focal Length of Concave Lens Experiment. It can be shown that the lens focal length is related to the distance between different Moiré images. Use a combination of lenses (for example, a 100 mm lens and a 200 mm lens). Fizeau interferometry The length focal length is calculated using the following formula: 1 6 + 1 7 = 1 U and V are measured from the principal planes. Measure the focal length and compare it to the theoretical value. Each lens is a converging lens & the focal length of each lens is known, f 1 and f2. Shaikh Ilyas; AIM: To determine the focal length of converging lens and it’s radius of curvature.

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