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

Options

  1. Abecome zero
  2. Bbecome infinite
  3. Cbecome small, but non-zero
  4. Dremain unchanged

Correct answer

B. become infinite

Step-by-step solution

When refractive index of lens is equal to the refractive index of liquid, the lens behave like a plane surface with focal length infinity.

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