An incident ray is parallel to the principal axis of a convex mirror. After the reflection, the reflected ray - A - Passes through centre of curvature
B - retraces the path of incident ray
C - goes to other side of the principal axis by obeying laws of reflection
D - appears to be diverging from principal focus

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