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PhysicsJEE Main 22 Jan 2026, Shift 1·Q14·MCQ·Moderate

Ray Optics · Refraction

A thin convex lens of focal length 5 cm and a thin concave lens of focal length 4 cm are combined together (without any gap) and this combination has magnification m1m_1 when an object is placed 10 cm before the convex lens. Keeping the positions of convex lens and object undisturbed a gap of 1 cm is introduced between the lenses by moving the concave lens away, which lead to a change in magnification of total lens system to m2m_2. The value of ∣m1m2∣\left|\dfrac{m_1}{m_2}\right| is .
  1. (1)59\dfrac59
  2. (2)527\dfrac{5}{27}
  3. (3)32\dfrac32
  4. (4)2527\dfrac{25}{27}

Flawed question. No option is correct as printed (∣m1/m2∣=5/6|m_1/m_2| = 5/6) and no single evident misprint leads to one of the options; dropped in the source key. It is shown for completeness and is left out of practice tests.

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