Geocentric Posted June 8, 2006 Report Share Posted June 8, 2006 # Diameter of a Plano-convex lens is 6 cm and the thickness at the center is 3 mm. If the speed of light in the material of the lens is 2 x 10^8 m/sec, what is the focal length of the lens?Could anyone help me to solve this problem? Quote Link to comment Share on other sites More sharing options...

Geocentric Posted June 11, 2006 Author Report Share Posted June 11, 2006 # Diameter of a Plano-convex lens is 6 cm and the thickness at the center is 3 mm. If the speed of light in the material of the lens is 2 x 10^8 m/sec, what is the focal length of the lens?Could anyone help me to solve this problem?Can anyone tell me how to find radius of curvature from the diametre and thicknes of the lens? If the radius of curvature is found then the focal length can be calculated, isn't it?B) Quote Link to comment Share on other sites More sharing options...

Geocentric Posted June 11, 2006 Author Report Share Posted June 11, 2006 # Diameter of a Plano-convex lens is 6 cm and the thickness at the center is 3 mm. If the speed of light in the material of the lens is 2 x 10^8 m/sec, what is the focal length of the lens?Could anyone help me to solve this problem?Can anyone tell me how to find radius of curvature from the diametre and thickness of the lens? If the radius of curvature is found then the focal length can be calculated, isn't it?B) Quote Link to comment Share on other sites More sharing options...

Turtle Posted June 11, 2006 Report Share Posted June 11, 2006 Can anyone tell me how to find radius of curvature from the diametre and thickness of the lens? If the radius of curvature is found then the focal length can be calculated, isn't it?B) Have you looked on the Web? Web Results 1 - 10 of about 91,200 for How to determine focal length of a lens. (0.26 seconds) http://www.mtholyoke.edu/~mpeterso/classes/phys301/geomopti/lenses.html Quote Link to comment Share on other sites More sharing options...

Tim_Lou Posted June 12, 2006 Report Share Posted June 12, 2006 if the lens is thin, you can use the lens maker's formula. if it is thick, there is something else... hmm:http://scienceworld.wolfram.com/physics/ThinLensFormula.htmlphysicsworld.wolfram.com is your friends buddy. Quote Link to comment Share on other sites More sharing options...

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