Find the radius of curvature of the convex surface of a plan-convex lens, whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5.

Find the radius of curvature of the convex surface of a plan-convex le

1.	Find the radius of curvature of the convex surface of a plan-convex lens, whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5.
Answer» Her `f=0.3Omega m=30cm, R_1= oo (" for plane surface "), R_2 =?,mu =1.5` On applying Lensmaker formula , we have `therefore (1)/(f) =(mu-1)((1)/(R_1)-(1)/(R_2)) rArr (1)/(30) =(1.5-1)((1)/(oo) -(1)/(R_2))` `rArr (1)/(30) =0.5 (-(1)/(R_2))rArr R_2=-0.5xx 30 =-15 cm` `therefore` Radius of curved surface =15 cm.

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Find the radius of curvature of the convex surface of a plan-convex lens, whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5.

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