physics - light

Question 1

what are the steps of the practical investigating light?

Answer 1

• draw a straight line and a line normal to it in the centre of a piece of paper
• place the block along the main line and shine the ray light at the position where the normal meets the block
• mark with crosses the incoming light, any any outgoing rays of light
• turn lights on and measure the angle of incidence, reflection and refraction

Question 2

what precautions should be taken to use the ray box safely?

Answer 2

• don’t touch any metal parts as the box gets hot when in use
• switch off when not in use to prevent overheating

Question 3

what condition is required for this experiment to work?

Answer 3

low lighting so that the light rays are visible

Question 4

what angles need to be measured and how?

Answer 4

• angle of incidence
• angle of refraction
• angle of reflection

~ measure with a protractor

Question 5

which angle is the angle of incidence?

Answer 5

the angle as measured between the incident (incoming) ray and the normal

Question 6

which angle is the angle of reflection?

Answer 6

the angle as measured between the reflected ray and the normal

Question 7

where do you draw the normal?

Answer 7

any line perpendicular to the surface to the mirror

Question 8

how do you draw the refracted ray?

Answer 8

connect the point where the ray entered the block and the point where the ray left the block on the other side with a straight line

Question 9

what does theory suggest about the angle of refraction for different materials?

Answer 9

it should be different for each material depending on its refractive index

Question 10

what does the theory suggest about the angle of incidence and the angle of reflection?

Answer 10

the angle of incidence should be the same as the angle of reflection