Does the block lens have symmetrical behavior? That is, do the rays converge at the same distances from the flat surface (whether they enter or exit from that surface)? Why might this be the case? Hint: look at the flat boundary; comment on the refraction that occurs there.

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?

How many astronauts have walked on the moon?