The red wavelengths of light are the longer wavelengths and the violet wavelengths of light are the shorter wavelengths. Between red and violet, there is a continuous range or spectrum of wavelengths.
The USPS also includes that a large postcard is 49 cents to mail. The maximum size for this postcard is 11 1/2 inches long, 6 1/8 inches high and 1/4 inch thick. This is the same rate to mail a First Class 1 ounce letter domestically. The rates for postage increased as of January 2014.
The price of mailing a 1-ounce First-Class Mail letter is now 47 cents, down from 49 cents. Letters with additional ounces have dropped to 21 cents (from 22 cents), postcards will be 34 cents (from. 35 cents), and letters and postcards to international destinations will fall to $1.15 (from $1.20).