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Geometrical Optics question

2019 · 10 Apr · Shift 1 · Q58
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Geometrical Optics question

2019 · 10 Apr · Shift 1 · Q58

JEE MainPhysicsGeometrical OpticsMCQ+4 / −1
One plano-convex and one plano-concave lens of same radius of curvature 'R' but of different materials are joined side by side as shown in the figure. If the refractive index of the material of 1 is μ\muμ 1 and that of 2 is μ\muμ 2, then the focal length of the combination is : JEE Main 2019 (Online) 10th April Morning Slot Physics - Geometrical Optics Question 181 English
  1. A
    2Rμ1−μ2{2R \over { {{\mu _1} - {\mu _2}}}}μ1​−μ2​2R​
  2. B
    R2−(μ1−μ2){R \over {2 - \left( {{\mu _1} - {\mu _2}} \right)}}2−(μ1​−μ2​)R​
  3. C
    Rμ1−μ2{R \over { {{\mu _1} - {\mu _2}}}}μ1​−μ2​R​
  4. D
    R2(μ1−μ2){R \over {2 \left( {{\mu _1} - {\mu _2}} \right)}}2(μ1​−μ2​)R​
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