A student determines the focal length of a device ‘x’ by focusing the image of a distant object on a screen placed 20cm from the device on the same side as the object. The device ‘X’ is

Me plz i don’t know the charges on each of these

Much of the information taught in earth-space science would not be available if it weren’t for our remote sensing abilities. explain two ways our remote sensing strategies contribute to our knowledge of these topics.

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?