Question

Why rainbow is formed always curved? why not straight? Or slant?

Answer 1

Rainbow which is formed by dispersion of white light into 7 colours (VIBGYOR) has different wavelength. Hence ,  Becz of having different wavelength the Colour Red which has highest wavelenght Is seen first and Then Colour Orange which has wavelength Less than red is dispersed Nxt And Then So On. . . . . . . . . . . Hence Rainbow Is Not Straight But In Curve

Answer 2

The Rainbow Curve. A rainbow is not actually shaped like a semicircle or an arc; that is simply the shape that we see. In fact, a rainbow is a circle, but we can't see the full shape because the horizon cuts off the lower half. ... The range of angles at which raindrops reflect is the real reason why rainbows are curved.