Question

a double convex lens have two surfaces of equal radill R and refractive index n,=1.5 then focal length​

Answer 1

Answer:

ANSWER

Given,

Radius of curvature =R

focal length =f

Refractive index, μ=1.5

From lens maker's formula

1/f = ( μ - 1 ) [ 1/R1 - 1/R2 ]

1/f = ( 1.5 - 1) [ 1/R + 1/R ]

=0.5 × 2/R

1/f = 1/R

f = R

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