Reflection practical

Question 1

Equipment

Answer 1

• lens
• ray box
• slit

Question 2

why use a slit

Answer 2

to produce a narrow ray of light

Question 3

Risk - Ray boxes get hot

Answer 3

switch them off when not in use

Question 4

Method

Answer 4

1 . Take a piece of A3 paper and draw a straight line down the centre (using a ruler)
2. Use a protractor to draw the normal
3. Place the glass box against the first line so that the normal is near the centre of the block
4. Draw around the glass box
5. Turn off all lights in the room
6. Use a ray box to direct a ray of light so it hits the block at the normal(incident ray), then adjust the ray box
7. at a certain angle, we can see a reflected ray from the blocks surface
8. we can also see a ray leaving the block from the opposite side called the transmitted ray
9. Mark the incident ray, reflected and transmitted with crosses
10. remove the glass box and draw in the rays
11. measure the angle of incidence, reflection AND REFRACTION
12. Repeat the experiment with blocks of a different material

Question 5

what can be used instead of a ray box

Answer 5

a laser

Question 6

why are tay boxes used

Answer 6

to provide a thin beam of light so that the angles of incidence and reflection can be easily and accurately measured