If India, Pakistan, and Sri Lanka were reflected to the opposite side of the northern hemisphere, they would appear roughly like this:
The purposes of this illustration are to give an idea of:
Note that India, Pakistan, and Sri Lanka appear backwards here but not upside-down: I reflected (rather than rotated) longitude points, but kept latitude points unmodified on the northern hemisphere.
If you are wondering about where you might end up by digging a hole through the center of the earth, check out the Wikipedia article on Antipodes, which has some nice illustrations.
(If you are too lazy to click: from India, you would end up in the Pacific Ocean, West of South America. From the US, you would end up the Indian Ocean, somewhere between Australia and South Africa)