Q.58 in an x-ray diffraction experiment with cu crystals having lattice parameter 3.61 a, x-rays of wavelength of o.090 nm are incident on the family of planes

Q.58 In an X-ray diffraction experiment with Cu crystals having lattice parameter 3.61 A, X-rays of wavelength of O.090 nm are incident on the family of planes {1 10). The highest order present in the diffraction pattern is -