Beacuse it it multiple mirrors is not fixed
The Brainliest Answer!
Because a prism is tringular in shape and when white light falls on it ,it splits the light into its seven constituent colour . while a sphere prism forms and act as a convex lens because sphere's surface bulges outwards and hence convex lens converges the light falling on it
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But raindrop is also act like a prism. And it forms a spectrum.
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