magnitude and direction of electric field

Thread Starter

smarch

Joined Mar 14, 2009
52
Can someone help me with the question attached as a JPEG to this post.

Am I correct to say that I have to use the formula :

ε1E1cosα = ε2E2cosβ
And then make β the subject to work out the direction?
And make E2 the subject to find the magnitude?


Any help will be appreciated, thanks.
 

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