JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
Five persons \(P_1, P_2, P_3, P_4\) and \(P_5\) recorded object distance (u) and image distance (v) using same convex lens having power +5 D as \((25,96),(30,62)\), \((35,37),(45,35)\) and \((50,32)\) respectively. Identify correct statement
- A Readings recorded by all persons are correct
- B Reading recorded by \(P_{3}\) persons are incorrect
- C Reading recorded by \(P_{3}\) and \(P_{2}\) persons are incorrect
- D Reading recorded by \(P_{4}\) and \(P_{5}\) persons are incorrect
Answer & Solution
Correct Answer
(B) Reading recorded by \(P_{3}\) persons are incorrect
Step-by-step Solution
Detailed explanation
\(P =+5 D\) \(\frac{1}{ f }=5 \Rightarrow f =20 cm\) ⇒ If object is between f & 2f image will be beyond 2f & magnified. ⇒ If object is beyond 2 f , image will be between f & 2f & diminished. Hence reading of \(P_3\) are incorrect.
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