0.05N H2SO4

Hello, I am not a chemist. In seeking answers for regeneration of activated alumina this is needed, 0.05N H2SO4 to neutralize the 1% NaOH pre treatment. I do not understand 0.05N. I assume it is the strength. If I have 20% H2SO4 how do I arrive at 0.05N? Please describe this in simple terms so I can

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