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JEE Main 2024 (9 Apr, Shift 1) · Spherical Surfaces & Thin Lenses

Spherical Surfaces & Thin Lenses question from JEE Main 2024 (9 Apr, Shift 1)

Q41JEE Main 2024 · 9 APR · SHIFT 1Easy

Spherical Surfaces & Thin Lenses

Given below are two statements:

Statement (I): When an object is placed at the centre of curvature of a concave lens, image is formed at the centre of curvature of the lens on the other side.

Statement (II): Concave lens always forms a virtual and erect image.

In the light of the above statements, choose the correct answer from the options given below:

Show answer and solution

Answer: (a)

  1. Statement I: for a concave lens (f=−Ff = -F) with the object at 2F2F: 1v=−1F−12F⇒v=−2F3\frac{1}{v} = -\frac{1}{F} - \frac{1}{2F} \Rightarrow v = -\frac{2F}{3}, a virtual image on the same side. So I is false.
  2. Statement II: for a real object a concave lens always gives a virtual, erect, diminished image. So II is true.
  3. So the answer is (a) Statement I is false but Statement II is true.
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