Question

Q3 C) Define (Any 2)
1) Complex machine
2) Reflection of light
3) Magnet keepers
4) Propagation of sound​

Answer 1

Answer:

1). A complex machine is a machine made up of two or more simple machines that make your work easier to do. There are six simple machines from which all complex machines are made. They include: The lever. The inclined plane.

2). Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. 

Explanation:

hope this helps you

mark this answer as brianliest