A normal CD player uses a laser with = 5 780 nm, whereas a Blu-ray player uses a laser with a shorter wavelength,

A normal CD player uses a laser with λ = 5 780 nm, whereas a Blu-ray player uses a laser with a shorter wavelength, λ = 405 nm. (These values are the wavelengths in air; the wavelengths are shorter in the plastic of each disc.) If the lasers in a CD player and a Blu-ray player have the same intensity, what is the ratio of the number of photons striking the two discs each second?