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If _{$R_{1}$} and _{$R_{2}$} are tae radii of curvature of double convex lens made of same material, the lens with more, focal length is

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R1=R2=20cm

R1=R2=10cm

R1=R2=5cm

R1=R2=2.5cm

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detailed solution

Correct option is A

1f=(μ−1) (1R1+1R2) 1f= 2(μ−1)R f∝R2 If R1=R2=20cm , f is more

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If R1 and R2 are tae radii of curvature of double convex lens made of same material, the lens with more, focal length is

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If _{$R_{1}$} and _{$R_{2}$} are tae radii of curvature of double convex lens made of same material, the lens with more, focal length is