Differentiate between nominal and real exchange rate. 

Nominal exchange rate is the rate which actually prevails in the foreign swap market. The real exchange rate is the rate which is adjusted to relative prices (price of foreign good separated by price of domestic good). Assume, in foreign exchange market, the nominal exchange rate is $/ Rs.2.00. That means we have to pay Rs.2.00 for $ 1.00 in foreign exchange market. When we talk about real exchange rate, then we adjust the nominal exchange rate with relative price ratio of foreign to domestic good. Now assume that the relative price ratio of foreign to domestic good is $10/ Rs.15. Therefore the real exchange rate is equal to Pf/Pd * Nominal exchange rate, i.e. 10$/15Rs * $/2Rs.