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PhysicsJEE Main 5 Apr 2026, Shift 2·Q15·MCQ·Easy–moderate

Ray Optics · Refraction

A thin convex lens and a thin concave lens are kept in contact and are co-axial. Which of the following statements is correct for this combination of two lenses?
  1. (1)behaves as concave lens if ∣fconvex∣>∣fconcave∣|f_{\text{convex}}| > |f_{\text{concave}}|
  2. (2)behaves as concave lens if ∣fconvex∣<∣fconcave∣|f_{\text{convex}}| < |f_{\text{concave}}|
  3. (3)behaves as convex lens if ∣fconvex∣>∣fconcave∣|f_{\text{convex}}| > |f_{\text{concave}}|
  4. (4)Focal length of the lens system will change if the positions of two lenses are interchanged
We corrected a printing error in the original paper

Source printed “if the position of two lenses are interchanged”.

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