State the sources of light (1)
Ans: luminous and non-luminous
Explain how we are able to see objects that do not emit light. (2)
Ans: Due to reflection of light entering our eyes from the object
In a Virtual image the eye must be placed between what two things to see the image? (2)
Ans: Two reflected rays
State the properties of a virtual image. (3)
Ans: laterally inverted
The size of the object and image is same
The distance between the object and the mirror is the same as the distance between the image and
the mirror
A line from the object to the image is perpendicular to the mirror
Differentiate between regular and diffuse reflection. (2)
Regular Diffuse
Image is formed Image is not formed
The incident rays are parallel the incident rays are parallel before reflection
And remain parallel after reflection Distorted after reflection
Smooth surface Rough surface
State the law of reflection (2)
The law of relfection states that the incident angle is always equal to the reflected angle
What is meant by a ray? (1)
A line that represents direction of light transfer
What happens in diffuse reflection? (1)
The incident angle is reflected in many different angles
State the definition of a normal, incident angle, and reflected angle. (3)
Normal is an imaginary line drawn perpendicular to the surface
Incident angle is the angle between the incident ray and the normal
Reflected angle is the angle between the reflected ray and the normal all of these lie on the same plane
What is reflection? (1)
The bouncing back of light from a surface without changing medium
State the value of the speed of light. (1)
3*10^8
What is a plane mirror? (1)
A reflective surface that is flat
How does light travel?
In the from of waves in straight lines
