Verified Solution • 2025–26 Session moderate

QJEEM20Phb694: JEE Main 2020 Physics - Class 12 JEEM20Phb694 Solution: For a concave lens of focal length f, the relation between…

For a concave lens of focal length f, the relation between object and image distances u and v, respectively, from its pole can best be represented by (u = v is the reference line) :

Multiple Choice Options

  • A https://ik.imagekit.io/novatra/photos/9103a64b8b1dca81f49a79137eedf4625224a3a354d84af4e4d4adccd1808658.webp
  • B https://ik.imagekit.io/novatra/photos/9ba74ada53bf2cf71e19c82550afa35bd54068eea8797998ed3d3731ebe7bf4d.webp
  • C https://ik.imagekit.io/novatra/photos/eea83b795a5957ab1e93ec346b09f3ada94e6926c4f50756c22cdd65508908d5.webp
  • D https://ik.imagekit.io/novatra/photos/6f6afd3ba56c467f169cbcc5b278505ac8f8acc509f988eede6972f9328be746.webp

Step-by-Step Verified Solution

v=ufu+f

Case-I

If v = u

⇒ f + u = f

⇒ u = 0

Case-II

If u = ∞

then v = f

So you can see both of them are equal only when v = 0 and u = 0.

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