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Siddharth Majumdar Grade: 12
        

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?



6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

diameter = 2 Radius (R)


 2R = 6


 R = 3cm


1/f = (u-1)/R      ......1      


this is the relation bw focal length of plano convex lens & u(refractive index) ...


u = c/v = 3*108/2*108 = 1.5


now put u in eq 1 , will get focal length

6 years ago
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