The refractive index is one of the most commonly measured physical properties when examining glass evidence in the forensic lab. It provides evidence as to the commotion and thermal history of the glass. There is one instance where the refractive index must be supplemented with additional evidence because this type of glass provides inconsistent data. That is
A) plate glass
B) leaded glass
C) optical glass
D) tempered glass

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.