Lenses (triple only)

Question 1

Describe the difference between a concave and convex lens

Answer 1

convex bulges out in the middle, concave is thinner in the middle than at the edges

Question 2

Describe what a convex lens does to parallel rays of light

Answer 2

light converges (comes together) at the principal focus

Question 3

Describe what a concave lens does to parallel rays of light

Answer 3

light diverges (spreads out) so they appear to have come from the principal focus

Question 4

State the definiton of the term focal length

Answer 4

distance from the centre of the lens to the principal focus

Question 5

What kind of images do concave and convex lenses produce?

Answer 5

concave = virtual, convex = real or virtual

Question 6

State the properties all EM waves of the same colour share

Answer 6

same range of wavelengths and frequencies

Question 7

State the four things can happen to visible light when it is incident on an object

Answer 7

transmitted, absorbed, reflected, or refracted

Question 8

Describe the difference between specular and diffuse reflection

Answer 8

specular = reflection from smooth surface, diffuse reflection from rough surface

Question 9

State the type of object that transmits visible light

Answer 9

transparent or translucent

Question 10

Explain why an object appears opaque

Answer 10

does not transmit visible light- absorbs and reflects the visible light

Question 11

Describe how coloured filters work

Answer 11

absorb certain wavelengths of light, transmit others