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A convex lens has a diameter of 30 mm and a depth of 5 mm at the center. How far from the vertex is the focus? See answer abanda is waiting for your help. Add your answer and earn points. Yna9141 Yna9141 The formula for determining the distance of the focus from the vertex is as follows, f = x² / 4a where f is focus, x is the radius (half the value of diameter), and a is the depth ...

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Diameter of a plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light ← Prev Question Next Question → 0 votes . 2.8k views. asked Nov 2, 2018 in Physics by Samantha (38.8k points) Diameter of a plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 x 10 8 m/s, the focal length of the lens is (a) 15 cm (b) 20 cm (c ...

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The lenses are now in order of increasing focal length within each lens diameter class and this page should be easier to find via the search engine. As always, we appreciate the presentation feedback and would like to thank you for the time you spent to make our website better. acable (posted 2007-08-23 19:30:58.0) The lenses are sorted by Dia and then by Item# which makes it really hard to ...

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The lenses were delivered as described, a small box containing 3 double convex and 3 double concave lenses, each packed in a separate and labeled envelope. The lenses are well polished to keep aberrations at a minimum. However, for classroom demonstrations, lenses with short focal lengths are more useful. My preference would be 10, 20, 30 mm instead of 20, 30, 50 mm.

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