A double convex lens has two surfaces of equal radii R and refractive index μ= 1.5. We have,
A double convex lens has two surfaces of equal radii R and refractive index μ= 1.5. We have,
(a) f= R/2
(b) f = R
(c) f = - R
(d) f =2R.
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The correct answer is (b) f = R
EXPLANATION:
From lens makers formula 1/f = (µ-1){1/R - 1/R'} here µ = 1.5, R' = -R
→1/f = 0.5*2/R =1/R
→f = R
Hence the option (b) is true.
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