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Q. When the negative feedback is practical to an amplifier of gain 50 the gain falls to 25. Compute the feedback ratio?
Af = A / 1 + Aβ
25 = 50 / 1 + 50 β
1 = 2 / 1 + 50 β
1 + 50 β = 2 (i.e) 50 β = 1
β = 1 /50 = 0.02
I think it is same as the apex angle of the prism or the angle of the prism. since it decides the angle of deviation as i+e=D+A(angle of the prism),D=deviation.
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