what is the difference between issue price n redemption price???

Answer 1

You're talking of bonds?

Every bond has a face value, say $1m, and a coupon or stated interest rate, say, 6%. But the market rate fluctuates. A bond can sell for more or less than the face value depending on whether the market or yield rate is higher or lower than the coupon rate.

A bond sells for lower than face value if the market rate is higher than the coupon rate, i.e. it sells at a discount. A bond sells for higher than the face value if the market rate is lower than the coupon rate, i.e. it sells at a premium.

A bond is always redeemed for its face value.

You can read the lecture at the link.