Reflection of Light

The angle of incidence for a plane mirror is 30⁰. What will be the angle between incident and reflected ray?

How can you say that light rays travels in a straight line?  

Write the difference between transparent, opaque and translucent medium.

Write one difference between real and virtual image? 

The diagram shows a patient having her eyes tested. A chart with letters on it is placed behind her, and she sees the chart reflected in a plane mirror.

How far away from the patient does the chart seem to be?

From the following diagram, find out the angle of incidence in case of a plane mirror, if angle between incident and reflected ray is ${75}^0$.  

Can a virtual image obtained on the screen? 

Can reflection take place for any surface? Justify.