Mr DK Mulla,
1. If your taxable income after all deductions is Rs 260000/-. There won't be any tax for you as income upto 250000/- is exempt and then there is rebate u/s 87A.
2. there will not be any tax on Rs 60000/- gifted to wife as you have to 1st consider the whole 2.6 L for taxation and then gift to her out of it.
3. If she invests the amount of rs 60000/-in say fixed deposits or other investments, and earnes interest of say Rs 6000/-, that interest will be clubbed with your income.