No. Opposites are just the positive and negative of the same number. For example, -4 is the opposite of 4 ( also think of it as in the same distance to 0 on a number line) Reciprocals on the other hand refer to the switching of the numerator and the denominator in a given fraction. For example 5/3 is the reciprocal of 3/5 ( reciprocals usually used in dividing fractions)

So take 3/5 its opposite is -3/5 its reciprocal is 5/3

So take 3/5 its opposite is -3/5 its reciprocal is 5/3