The sensitivity of photographic film is so high that each photon causes a black spot to appear on it. Three photos of the square were taken at a wavelength of 5⋅10−5 cm. The image dimensions are 10×10 cm. Estimate, using the Planck formula ε = hν (h = 6.62⋅10−27 erg ⋅s - Planck's constant), the illumination of the photographic plate in each case. The camera's shutter response time is 10−9 seconds.