What do you understand by illuminated objects? Give two examples.

See this sculpture of a man's face. Depending on the direction from which light falls on it, the view changes. Given here is the view when the light falls on it from the front.

From which direction is the light falling in the case shown below?

Differentiate between the following:

Regular reflection and diffused reflection

In which medium the speed of light is minimum? 

Look at the photograph and answer the questions. How many illuminated objects are there? (Write the answer in words)

Light travels much slower than sound in air.