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A bi-convex lens is formed with two thin plano-convex lenses as shown in the figure. Refractive index n of the first lens is 1.5 and that of the second lens is 1.2. Both the curved surface are of the same radius of curvature R = 14 cm. For this biconvex lens, for an object distance of 40 cm, the image distance will be
  • a)
    -280.0 cm
  • b)
    40.0 cm
  • c)
    21.5 cm
  • d)
    13.3 cm
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A bi-convex lens is formed with two thin plano-convex lenses as shown ...
The focal length (f1) of the lens with n = 1.5 is given by
The focal length (f2) of the lens with n = 1.2 is given by
The focal length F of the combination is
Applying lens formula for the combination of lens
⇒ V = 40 cm
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A bi-convex lens is formed with two thin plano-convex lenses as shown ...
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A bi-convex lens is formed with two thin plano-convex lenses as shown ...
The focal length (f1) of the lens with n = 1.5 is given by
The focal length (f2) of the lens with n = 1.2 is given by
The focal length F of the combination is
Applying lens formula for the combination of lens
⇒ V = 40 cm
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A bi-convex lens is formed with two thin plano-convex lenses as shown in the figure. Refractive index n of the first lens is 1.5 and that of the second lens is 1.2. Both the curved surface are of the same radius of curvature R = 14 cm. For this biconvex lens, for an object distance of 40 cm, the image distance will bea)-280.0 cmb)40.0 cmc)21.5 cmd)13.3 cmCorrect answer is option 'B'. Can you explain this answer?
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