At minimum brightness, the apparent magnitude of the star was 12.6. Determine the brightness of a star at maximum luminosity

At minimum brightness, the apparent magnitude of the star was 12.6. Determine the brightness of a star at maximum luminosity if the brightness has increased 760 times.

decision
lgE1 / E2 = 0.4 (m2 – m1); m1 = 5.3.

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