Our eyes can see light with an angular resolution of about 1’—equivalent to about a third of a millimeter at arm’s length. Suppose our eyes detected only infrared radiation, with 1° angular resolution. Would we be able to make our way around on Earth’s surface? To read? To sculpt? To create technology?

We would not be able to make our way around the earth's surface, to read, to sculpt or to create technology because we cannot see!

Explanation:

The minimum angular separation that can be distinguished by an eye gives the angular resolution of the eye.

Given that the Angular resolution with infrared radiation is = equal to

This resolution is very much greater than that of the eye

The angular resolution that our eyes can see is about    at arms length

Angular resolution of infrared =  at arms length

We therefore cannot read, sculpt or create technology because we cannot see.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000