1.

calculate focal length of the biconvex lens of air if radii of its surface are f0 to 15 cm refractive index of glass 1.5

Answer»

1/f={n-1)(1/R)...from lens maker formula1/f=(1.5-1)(1/15)1/f=0.5/15f=15/0.5=150/5=30cm



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