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Answer 1

Answer:

1.Luminous object-Object that can emit light frm themselves are known as luminous objects

2.Non-luminous object-Object that cannot emit light frm themselves are known as non luminous objects

3.Transparent object-The object through which light passes completely is known as transparent Object

4.Translucent object- The object through which the light doesn't pass completely is known as translucent object

5.Opaque object- The object through which light doesn't pass at all is known as opaque object

6.Rectilinear propagation of light- It describes the tendency of electromagnetic waves to travel in straight line.