How do Othello and others learn about Iago's truth? Why does Othello look at Iago's feet in Act 5?

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Othello and the others learn the truth about Iago from Emilia when she tells them that Desdemona never gave her handkerchief to Cassio. Emilia reveals that, in fact, she herself found Desdemona's handkerchief and gave it to Iago, not knowing what he was going to do with it. She says,
No, alas, I found it
And I did give ’t my husband.
At this point, it is obvious that Iago planted the handkerchief to make it look like Cassio and Desdemona were having an affair. Although Iago calls his wife a liar and stabs her, it is too late. As Emilia is dying, she confirms to Othello that Desdemona was faithful to him:
Moor, she was chaste, she loved thee, cruel Moor.
So come my soul to bliss, as I speak true.

Othello is so horrified at what Iago has done that, remembering a fable that a devil has cloven feet, he looks down at Iago's feet to see if Iago is, indeed, a demon. Of course, as Othello says, he knows Iago is not really a devil, because he knows he can kill him. Othello states, right before he stabs Iago,
I look down towards his feet, but that’s a fable.
If that thou be’st a devil, I cannot kill thee.
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Othello and the others learn the truth when Emilia tells them about the handkerchief:

"Oh, thou dull Moor! That handkerchief thou speak'st of
I found by fortune and did give my husband;
For often, with a solemn earnestness,
More than indeed belonged to such a trifle,
He [Iago] begged of me to steal't." (V, ii) 

According to David Bevington's The Necessary Shakespeare (2nd ed.), Othello looks at Iago's feet to see if he had cloven feet like the devil. Now, that doesn't mean he really thought Iago might have cloven hooves - it's Shakespeare being metaphorical and demonstrating that Othello has finally learned that he's been led astray the entire time by Iago.

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