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We know Pogson formula, which relates difference in magnitude to light fluxes: $$10^{0.4 (m_1-m_2)}=\frac{j_2}{j_1}$$ Let's assume that Moon reflects light isotropically. Moon is scattering the light that falls onto it, so we can say that the light flux at full moon is double of that at first quarter: $\frac{j_2}{j_1}=\frac{1}{2}$. Also, we are given $m_1=-...


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