India has launched what it says is the world's cheapest touch-screen tablet computer, priced at just $35 (£23).

Costing a fraction of Apple's iPad, the subsidised Aakash is aimed at students.

It supports web browsing and video conferencing, has a three-hour battery life and two USB ports, but questions remain over how it will perform.

Officials hope the computer will give digital access to students in small towns and villages across India, which lags behind its rivals in connectivity.