100 POINTS! Please help
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The following question is about the poem "Autumn Song" by Sarojini Naidu.
Autumn Song by Sarojini Naidu

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Like a joy on the heart of a sorrow,
The sunset hangs on a cloud;
A golden storm of glittering sheaves*,
Of fair and frail and fluttering leaves,
The wild wind blows in a cloud.

Hark to a voice that is calling
To my heart in the voice of the wind:
My heart is weary and sad and alone,
For its dreams like the fluttering leaves have gone,
And why should I stay behind?

*a sheaf is a bundle of harvested grain that's tied together—sheaves is plural

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Explain the author's purpose of the poem. Identify and explain one example of figurative language and how the author hoped it affected the reader.