P14 - light

Question 1

what is reflection

Answer 1

light bouncing off of a reflective surface

Question 2

what is the law of reflection

Answer 2

the angle of incidence = the angle of reflection

Question 3

what is the difference between specular and diffuse reflection

Answer 3

specular (shiny) is where the light waves bounce off a flat surface in parallel, diffuse (matte) is where the light waves bounce off a bumpy surface in different directions.

Question 4

what is refraction

Answer 4

when light enters an object of a different density it bends towards the normal (think of the car analogy)

Question 5

why are objects certain colours

Answer 5

they reflect that colour light and absorb the best

Question 6

what is the difference between a concave and convex lens

Answer 6

concave bends light outwards - two caves
convex bends light inwards

Question 7

what is the focal point of a convex lens

Answer 7

the point where if all the light rays go in parallel that they cross

Question 8

what is the focal length

Answer 8

the distance from the focal point to the centre of the lens

Question 9

for a convex lens, if the object is more than twice the focal length away, what will the image be

Answer 9

inverted, diminished, real

Question 10

for a convex lens, if the object is more than the focal length but less that 2 focal lengths away, what will the image be

Answer 10

inverted, enlarged, real

Question 11

for a convex lens, if the object is closer than the focal length, what will the image be

Answer 11

upright, enlarged, virtual (look on p14 one note page)

Question 12

for a convex lens, how do you make the focal length shorter

Answer 12

more curvy or thicker lens

Question 13

for a concave lens, what will the image be

Answer 13

upright, diminished, virtual