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 ?

Question

G1 Physics · Accepted Answer

Derived solution: Step 1: Use the thin-lens formula 1/f = 1/v - 1/u with m = v/u. For lens material/medium changes use the lens-maker relation with the relative refractive index; powers of thin lenses in contact add. Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is Image disappears. Therefore the correct option is A.