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  4. Formation of real image using a biconvex lens is shown below: If the whole set up is immersed in water without disturbing the object and the screen position, what will one observe on the screen?

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Q. Formation of real image using a biconvex lens is shown below :
If the whole set up is immersed in water without disturbing the object and the screen position, what will one observe on the screen?Physics Question Image

JEE MainJEE Main 2019Ray Optics and Optical Instruments

Solution:

$From \, \, \frac{1}{f} \, = \, (\mu_{rel} \, - \, 1)\bigg(\frac{1}{R_1}-\frac{1}{R_2}\bigg)$
Focal length of lens will change hence image
disappears from the screen