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Formation of real image using a biconvex...

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 positions, what will one observe on the screen ?

A

No change

B

Image disappears

C

Magnified image

D

Erect real image

Text Solution

Verified by Experts

The correct Answer is:
B
`f_("air") = f`
`(1)/(f_("m")) = ((mu_(0))/(mu_(m)) - 1) ((1)/(R_(1)) - (1)/(R_(2)))`
`(f_(m))/(f_("air")) = ((mu_(g) - 1))/(((mu_(g))/(mu_(m)) - 1)), " "f' = f(((3)/(2)-1)/((3)/((2)/(4//3)-1)))=f//12`
`f' lt f`
Hence image will not be on screen hence disappears.
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