A LARGE BOWL CONTAINS WATER 10cm DEEP AND HAS A SMALL ELLECTRIC LAMP

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A LARGE BOWL CONTAINS WATER 10cm DEEP AND HAS A SMALL ELLECTRIC LAMP AT THE BOTTOM.A DISC OF CARDBOARD IS FLOATING ON THE SURFACE WITH ITS CENTRE VERTICALLY ABOVE THE LAMP, AND IS OF SUCH DIAMETER THAT THE LAMP CAN JUST NOT BE SEEN BY A PERSON LOOKING INTO THE WATER. CALCULATE THE DIAMETER OF THE DISC.REFRATIVE INDEX OF WATER IS 1,33.

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