Using Waves RQP- reflection of light by different surface and refraction of light by different substances

Question 1

method 1 (reflection)

step 1

Answer 1

draw a line to represent a plane mirror in the middle of a landscape piece of A4 paper and add a dotted line perpendicular to it in the centre of it for the normal using a protractor

Question 2

method 1 (reflection)

step 2

Answer 2

draw an incident ray at 10degrees to the normal, then every 10degrees until 80degrees

Question 3

method 1 (reflection)

step 3

Answer 3

place the mirror on the mirror line

Question 4

method 1 (reflection)

step 4

Answer 4

set up a ray box with a single slit inside and shine a ray of light along the 10degrees incident ray lines

Question 5

method 1 (reflection)

step 5

Answer 5

mark the reflective ray

Question 6

method 1 (reflection)

step 6

Answer 6

repeat with different angles on incidence

Question 7

method 1 (reflection)

step 7

Answer 7

remove the mirror and ray box, fully draw in all the reflected rays and measure the angles of reflection (between the ray and the normal) using a protractor

Question 8

method 1 (reflection)

step 8

Answer 8

compare the angles of incidence and reflection

Question 9

method 2 (both reflection and refraction)

step 1

Answer 9

Set up a ray box, slit and lens so that a narrow ray of light is produced.

Question 10

method 2 (both reflection and refraction)

step 2

Answer 10

Place a 30 centimetre (cm) ruler near the middle of a piece of plain A3 paper. Draw a straight line parallel to its longer sides. Use a protractor to draw a second line at right angles to this line. Label this line with an ‘N’ for ‘normal’.

Question 11

method 2 (both reflection and refraction)

step 3

Answer 11

Place the longest side of a rectangular
acrylic polymer
block against the first line. With the normal near the middle of the block, carefully draw around the block without moving it.

Question 12

method 2 (both reflection and refraction)

step 4

Answer 12

Use the ray box to shine a ray of light at at an angle to the point where the normal meets the block. This is the
incident ray
.

Question 13

method 2 (both reflection and refraction)

step 5

Answer 13

The angle between the normal and the incident ray is called the
angle of incidence
. Move the ray box or paper to change the angle of incidence. The aim is to see a clear ray reflected from the surface of the block and another clear ray leaving the opposite face of the block.

Question 14

method 2 (both reflection and refraction)

step 6

Answer 14

Using a pencil on the paper, mark the path of:
the incident ray with a cross
the
reflected ray
with a cross
the ray that leaves the block with two crosses - one near the block and the other further away

Question 15

method 2 (both reflection and refraction)

step 7

Answer 15

Remove the block. Join the crosses to show the paths of the light rays.

Question 16

method 2 (both reflection and refraction)

step 8

Answer 16

Repeat steps 2 to 7 for a rectangular glass block.

Question 17

method 2 (both reflection and refraction)

step 9

Answer 17

Measure the angle of incidence, angle of refraction and angle of reflection for each block.