Question

What will happen if an obstacle is placed in the path of light travelling in a straight line

Answer 1

If the object is polished long will reflect back and if it is opaque it will not reflect

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Answer 2

When an obstacle will be placed in the path of light travelling then according to the surface light will reflect.

i). When ray of light fall on the plane or smooth surface then it will reflect in other direction.

ii). When a ray of light will fall on rough surface then it will dispersed into different directions.