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?
A
Erect real image
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B
Image disappears
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C
Magnified image
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D
No change
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Solution
The correct option is B Image disappears we know that: 1f=(μ−1)(1R1−1R2)
Focal length of lens will change if the whole set up is immersed in water without disturbing the object and the screen position.
From lens formula if focal length will change then image location will change hence image disappears from the screen.