Hamilton was 23 seconds behind Rosberg at the finish, saying he destroyed his tyres while trapped behind Felipe Massa's slower Ferrari.
"It's good we got some points, but [the problem] was the strategy," said Hamilton.
"It was so hard to pass the Ferrari.
Indian Grand Prix
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27/10/2013 AT 13:17
"I just tried to hang in there and tried to get past, but destroyed the tyres.
"A pretty poor race for myself, but it's OK, these things happen.
"It was unfortunate but we've got more races ahead of us."
Rosberg admitted that getting past Massa in the first pitstops was critical to his runner-up finish.
"The start was a bit difficult dropping behind Massa," said the German.
"He was definitely slower.
"I tried to pass him one lap and he got it back. The team did a fantastic strategy to get past him.
"It was important to have a normal weekend, get a lot of points and now we've giving Ferrari a run for their money in the constructors'."
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