Ido not know why but the answer is 684 let me know why.  a light with a second-order dark band forms a diffraction angle of 20.0°. the diffraction grating has 200.0 lines per mm.the wavelength of the light, to the nearest whole number, is    nm.

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i just did this and got a 100.

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards