Assessed Prac 5 & 6

• Student A
• Student B
• Student C
• Cannot be determined

When doing ray diagrams, what is the minimum distance the pins should be apart for ACCURACY?

• 3cm

• 4cm

• 5cm

• 6cm

Should you line up the top or bottom of pins in ray diagrams?

• Top

• Bottom

Why should you line up the bottom of pins while drawing a ray diagram?

• In case they are not put in at right angles (perfectly upright) to the paper

• It is more reliable

• Easier to see

• The bottom of the pins produces the correct angles

Which part of the mirror does the light reflect off?

• part 1) the glass cover

• part 2) shiny silver surface

• part 3) Wooden backboard

• part 4) Back of mirror

A mirror is lined up with a line so that the front of the glass part is on the line. What inaccuracy could this cause when drawing a ray diagram?

• the light reflects off the shiny part, not the front of the mirror

• it is difficult to draw a normal line

• It is difficult to measure the angles

• you can't see the pins correctly

What does this graph show? (choose 2)

• Directly proportional

• Inversely proportional

• Non linear relationship

• Linear relationship

x is proportional to y. You plot a graph of x against y. What two things would you look for in this graph to confirm this?

• Straight line (linear)

• Line goes through origin

• Line has a gradient of 1

• Line is curved at a constant rate

Write a conclusion about the relationship between angle and s-r.

• s-r is double the angle

• s-r is always large than the angle

• s-r is always 10 above the angle

• there is no relationship

If you are asked to justify your conclusion, what should you do?

• Use values from the table e.g. when x is 5, y is 10

• Say the "table shows it"

• Say "look at the graph"

• Use the equation to get an answer