Physics · 2019
JEE Main · 8 April 2019, Shift 2 · Q23
A convex lens (of focal length 20 cm) and a concave mirror, having their principal axes along the same lines, are kept 80 cm apart from each other.…
A convex lens (of focal length $\displaystyle 20$ cm) and a concave mirror, having their principal axes along the same lines, are kept $\displaystyle 80$ cm apart from each other. The concave mirror is to the right of the convex lens. When an object is kept at a distance of $\displaystyle 30$ cm to the left of the convex lens, its image remains at the same position even if the concave mirror is removed. The maximum distance of the object for which this concave mirror, by itself would produce a virtual image would be:
Official answer
(4)
$\displaystyle 10$ cm
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.