What special name is given to the angle of incidence i, when the effect shown in the diagram occurs?
(6)
In the diagram the value of the angle i is 41.8°. Calculate a value for the refractive index of the glass.
(6)
Draw a diagram to show what happens to the ray of light when the angle of incidence i is increased to 45°.
(6)
Give one application of the effect shown in the diagram you have drawn.
(5) ( n = 1
______ sin C
)
Higher Level 2012
12. (b) The diagram shows a ray of light as it leaves a rectangular block of glass. As the ray of light leaves the block of glass, it makes an angle θ with the inside surface of the glass block and an angle of 30° when it is in the air, as shown.
(i)
If the refractive index of the glass is 1.5, calculate the value of θ.
(ii) What would be the value of the angle θ so that the ray of light emerges parallel to the side of the glass block?
(9) (iii) Calculate the speed of light as it passes through the glass. (7)
2011 12. (b) State the laws of refraction of light.
(6)
A lamp is located centrally at the bottom of a large swimming pool, 1.8 m deep.
Draw a ray diagram to show where the lamp appears to be, as seen by an observer standing at the edge of the pool.
(7)
At night, when the lamp is switched on, a disc of light is seen at the surface of the swimming pool. Explain why the area of water surrounding the disc of light appears dark.
Calculate the area of the illuminated disc of water. (refractive index of water = 1.33)
2008
9. What is meant by refraction of light? State Snell’s law of refraction.
(12)
An eye contains a lens system and a retina, which is 2.0 cm from the lens system.
