The refractive index of converging lens is 1.4. What will be the focal length of this if it is placed in a medium of same refractive index? Assume the radii of curvature of the faces of lens are R₁ and R₂ respectively.
The refractive index of converging lens is 1.4. What will be the focal length of this if it is placed in a medium of same refractive index? Assume the radii of curvature of the faces of lens are R₁ and R₂ respectively.
Option 1 -
1
Option 2 -
(R₁R₂)/(R₁-R₂)
Option 3 -
Infinite
Option 4 -
Zero
Asked by Shiksha User
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1 Answer
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Correct Option - 3
Detailed Solution:Using lens maker formula, we can write
1/f = (µ/µ? - 1) (1/R? - 1/R? )
µ = µ? ⇒ 1/f = 0 ⇒ f → Infinite
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