One face of an equiconvex lens is silvered. The radius of curvature is 40 cm and refractive index of material of lens is 1.5 . An object is placed at 10 cm on the side of lens which is not silvered, then the final image will form at 
a) 10 cm
b) 20 cm 
c) 40 cm
d) infinity

Dear student
1feq=2fl+1-fmirror=2(μ-1)(2R)-2R=2R{2μ-2-1}=2R{2μ-3}now using mirror formula1v=1feq-1u=12-40{2×1.5-3}-1-10=infinityRegards

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