Science 8 – Mirrors and Lenses ANSWERS Chapter 11 - Review Science 8 – Mirrors and Lenses ANSWERS

What are these mirrors called? B Concave C Convex A Plane

How would the incident ray reflect off a plane mirror. Draw it How would the incident ray reflect off a plane mirror? Draw it. Label any rays and angles

What is the name of the point where the incident ray hits the reflecting surface? Point of incidence

What are the two types of reflection? Specular reflection Diffuse reflection

What is the difference between diffuse reflection and specular reflection? Diffuse reflection: The light rays reflect off a rough surface in all different directions and no image is formed. Specular reflection: The light rays reflect off a smooth surface and an image is formed.

Which of these would be specular reflection Which of these would be specular reflection? Which would be diffuse reflection? Light reflecting off a calm lake - SPECULAR Light reflecting off a painted wall - DIFFUSE Light reflecting off aluminum foil - DIFFUSE Light reflecting off a shiny metal - SPECULAR

What are the two laws of reflection? The angle of incidence equals the angle of reflection. 2) The incident ray, normal, and reflected ray all lie in the same plane.

What is the difference between a real and virtual image? A real image can be placed on a screen, but a virtual image cannot.

What are the two possible attitudes of an image? Upright Inverted

What are the shapes of a concave mirror and a convex mirror?

What happens to light rays that hit a concave mirror? They converge

What happens to light rays that hit a convex mirror? They diverge

What is the point where light rays converge? Focal point

Draw the image of the ray diagram

For the ray diagram, what is the size, attitude and type? Black arrow = object Red arrow = image SIZE: smaller than the object ATTITUDE: inverted TYPE: real

For the ray diagram, what is the size, attitude and type? Black arrow = object Red arrow = image SIZE: larger than the object ATTITUDE: inverted TYPE: real

For the ray diagram, what is the size, attitude and type? Black arrow = object Blue arrow = image SIZE: smaller than the object ATTITUDE: upright TYPE: virtual

What is the line through the centre of a mirror called? Normal OR Principal axis

Which type of mirror will magnify an object Which type of mirror will magnify an object? (magnify = make it look larger) Concave

Complete the table Plane Mirror Concave Mirror (closer than focal point) Concave Mirror (farther than focal point) Convex Mirror Size of image Same as object Larger than the object Smaller than the object Attitude of image Upright Inverted Location of image Behind the mirror In front of the mirror Type of image Virtual Real

What happens as light travels from air to water? It refracts (bends)

What do concave and convex lenses look like?

Draw and describe what happens to light rays that pass through a concave lens. Diverge

Draw and describe what happens to light rays that pass through a concave lens. Converge