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InterviewSolution
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(b) Write the Lens Maker's formula and use it to obtain the range of mu (The refractive index of the material of the lens) for which the focal length of and equiconvex lens, kept in air, would have a greater magnitude than that of the radius of curvature of its two surfaces. |
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Answer» Solution :Lens Maker's FORMULA is `(1)/(f)=(mu-1)((1)/(R_(1))-(1)/(R_(1)))` Here `R_(1)=R,R_(2)=-R` `(1)/(f)=(nu-1)((1)/(R_(1))+(1)/(R_(1)))IMPLIES(1)/(f)=(mu-1)((2)/(R))` `mu-1=(R)/(2f)` When `fgtR` `mu-1lt(1)/(2)impliesmult1+(1)/(2)` `mult(3)/(2)`. |
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