Two narrow slits separated by $0\mathrm{.}44$ mm are illuminated by monochromatic light of wavelength $687$ nm$.$ How many bright fringes can be seen on a screen $1\mathrm{.}5$ cm wide placed $1\mathrm{.}6$ m in front of the slits? Two narrow slits separated by $0\mathrm{.}44$ mm are illuminated by monochromatic light of wavelength $687$ nm $.$ How many bright fringes can be seen on a screen $1\mathrm{.}5$ cm wide placed $1\mathrm{.}6$ m in front of the slits?