JEE Main 2022 Physics question

PhysicsRay Optics and Optical InstrumentsJEE Main 2022

For an object placed at a distance 2.4 m from a lens, a sharp focused image is observed on a screen placed at a distance 12 cm form the lens. A glass plate of refractive index 1.5 and thickness 1 cm is introduced between lens and screen such that the glass plate plane faces parallel to the screen. By what distance should the object be shifted so that a sharp focused image is observed again on the screen?

Answer: (2)

Solution

The shift produced by the glass plate is − 1/1.5) = 1/3 cm, so the image must now be formed by the lens at (12 − 1/3) = 35/3 cm from it. From the

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Question ID VK-024661