A glass hemisphere of radius 0.04 m and R.I. of the material 1.6 is placed centrally over a cross mark on a paper (i) with the flat face; (ii) with the curved face in contact with the paper. In each case the cross mark is viewed directly from above. The position of the images will be
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Case (i) When flat face is in contact with paper.
where
= R . I . of medium in which light rays are going = 1
= R . I . of medium from which light rays are coming = 1.6
u = distance of object from curved surface = – 0.04 m
R = – 0.04 m .
i.e. the image will be formed at the same position of cross.
Case (ii) When curved face is in contact with paper
(Below the flat face)
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