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

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a

R1=10cm, R2=5cm

b

R1=R2=10cm

c

R1=R2=5cm

d

R1=R2=2.5cm

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detailed solution

Correct option is B

1f=(μ−1) (1R1+1R2) If R1=R2=10cm , f is more

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A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $μ_{1}$ and $μ_{2}$ and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is

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