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NEET 2023
Exam
NEET
Year
2023
Subject
Physics
Chapter
Ray Optics

NEET 2023 · Physics · Ray Optics

An object is mounted on a wall. Its image of equal size is to be...

An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance xx in front of the second wall. The required focal length of the lens will be

Options

  1. Ax2\frac{x}{2}
  2. Bx4\frac{x}{4}
  3. CLess than x4\frac{x}{4}
  4. DMore than x4\frac{x}{4} but less than x2\frac{x}{2}

Correct answer

A. x2\frac{x}{2}

Step-by-step solution

Height of image of object equal to height of object for convex lens. If object is placed at 2f2 f 2f=x2 f=x f=x2f=\frac{x}{2}
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