If viewed from a position not exactly perpendicular to the ruler, the apparent position will shift and the reading will be less accurate than the ruler is capable of.

The glass would shatter for sure, but unless I took all the time I needed to make absolutely certain the trajectory was exactly perpendicular to the window the bullet would deflect.

Ensuring that the connector is exactly perpendicular to the ribbon cable place the whole assembly into a vice and slowly squeeze the parts together.

This is unlike a planar mirror, which does this only if the mirror is exactly perpendicular to the wave front, having a zero angle of incidence.

Replies: Assuming the light is flashed in all directions (spherically), any light emitted in a direction other than exactly perpendicular to the mirrors will eventually escape.

When fastening, make sure the long edges of the material are exactly perpendicular to the roller.

I. The simplest approach may be not to put exactly perpendicular to but to leave enough regular Sagnac effect in to avoid lock-in.

The line of sight of the telescope needed to be exactly perpendicular to the axis of rotation.

The hardest part of the duffek is keeping your paddle vertical right by your knee, and keeping the power face always facing exactly perpendicular with the current you are grabbing.

If a planet spun exactly perpendicular to its orbit, the maximum amount of sunlight would always fall on the Equator instead of alternating between northern and southern hemispheres.