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Geometrical Optics question

2023 · Q162
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Geometrical Optics question

2023 · Q162

NEETPhysicsGeometrical OpticsMCQ+4 / −1

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 x in front of the second wall. The required focal length of the lens will be :

  1. A
    less than x4\frac{x}{4}4x​
  2. B
    more than x4\frac{x}{4}4x​ but less than x2\frac{x}{2}2x​
  3. C
    x2\frac{x}{2}2x​
  4. D
    x4\frac{x}{4}4x​
View written solutionFree

Correct answer: C

NEET 2023 Manipur Physics - Geometrical Optics Question 6 English Explanation

$\mathrm{x=2f}$

$\mathrm{f=x/2}$

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