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A convex lens is dipped in a liquid whose refractive index is equal to refractive index of lens material. Then its focal length will

Options

  1. Abecome infinite
  2. Bremain same
  3. Cdecrease
  4. Dbecome zero

Correct answer

A. become infinite

Step-by-step solution

Given that refractive of liquid is equal to refractive index of lens. n_ lens =n_ liquid Let the focal length be f . From lens makers formula, we get 1 f = (n_ lens -n_ liquid ) n_ liquid ( 1 R₁ - 1 R₂ ) Here, n_ lens -n_ liquid =0 Therefore, the focal length will be infinite.

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