| Formation of real image using a biconvex lens is shown below- [JEE Main 12-Jan-2019 Evening] |
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| If the whole set up is immersed in water without disturbing the object and the screen positions, what will one observe on the screen? |
A) Image disappears
B) Magnified image
C) Erect real image
D) No change
Correct Answer: A
Solution :
| [a] The focal length of the lens is given as |
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| If the setup is immersed in water, the focal length of the lens increases. Hence the image shifts further away from the lens; while the position of screen has been kept unchanged. So, the image will not be observed on the screen. |
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