A student investigates the refraction of light as it passes out from a glass block into the air.
Each time the student changes the angle of incidence (i) in the glass block he measures the
angle of refraction (r) in the air.
The student’s results are given in the table.
Angle of incidence (i)
|
Angle of refraction (r)
|
20°
|
31°
|
30°
|
49°
|
42°
|
90°
|
50°
|
no refracted ray
|
70°
|
no refracted ray
|
(a) (i) What name is given to the angle of incidence
that produces an angle of refraction equal to 90°? (1 mark)
(ii) What happens to the light once the angle of
incidence exceeds 42°? (1 mark)
(iii) Use data from the table to calculate the
refractive index of the glass block.
Write
down the equation you need to use and show how you work out your answer. (2
marks)
(b) A doctor may use
an endoscope to look directly inside a patient’s body. Explain how an endoscope
works. (4 marks)
No comments:
Post a Comment