Explanation
A diode is used as rectifier to convert AC to DC.
In positive half cycle one diode is in forward biasing and other is in reverse biasing while in negative half cycle their polarity reverses and direction of current is opposite through R for positive and negative half cycles so out put is not rectified.
Since, R1 and R2 arc different hence the peaks during positive half and negative half of the input signal will be different.
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