P14 - Light

Question 1

Reflection consists of?

Answer 1

Light waves

Question 2

Frequency, speed & wavelength of

reflected and incident waves?

Answer 2

Same, same, same

Question 3

Normal?

Answer 3

Line perpendicular to mirror

Question 4

Virtual image?

Answer 4

Can’t be projected onto a screen

Question 5

Real image?

Answer 5

Can be projected onto a screen

Question 6

Specular reflection?

surface and direction?

Answer 6

Reflection from a smooth surface

Parallel light rays reflected in 1 direction

Question 7

Diffuse reflection?

surface and direction?

Answer 7

Reflection from a bumpy surface

Light scattered in different directions

Question 8

Angle of incidence?

Answer 8

Angle between incident ray and normal ray

Question 9

Refraction?

Answer 9

Change of direction of waves when they travel across a boundary from one medium to another

Question 10

Law of reflection?

Answer 10

angle of incidence = angle of reflection

Question 11

What happens to angle of refraction when light rays refract when they travel from air into glass?

Answer 11

angle of refraction is less then the angle of incidence

Question 12

What happens to angle of refraction when light rays refract when they travel from glass into air?

Answer 12

angle of refraction is more than the angle of incidence

Question 13

What happens to wavelength of light as you go down the spectrum from violet to red?

Answer 13

wavelength increases

Question 14

D. Transparent?

Answer 14

lets all the light that enters it pass through it and doesn’t scatter or refract the light inside the object

Question 15

D. Translucent?

Answer 15

lets light through but scatters or refracts the light inside it

Question 16

D. Opaque?

Answer 16

absorbs all the light that reaches it. light that hits it is either reflected. scattered at the surface or absorbed by the object - no light passes all the way through - cant see through it

Question 17

Colour of the surface of an object depends on…

Answer 17

pigments of the surface materials and wavelengths of light that the pigments absorbs

Question 18

Convex lens?

Answer 18

(or converging) focuses parallel rays at a point called the principle focus

Question 19

Concave lens?

Answer 19

(or diverging) makes light rays spread out (diverge) so they focus on the principle focus of the lens

Question 20

What lens is used to correct short sight?

Answer 20

diverging / concave

Question 21

What lens is used to correct far sight?

Answer 21

converging / convex

Question 22

E. Magnification?

Answer 22

image height / object height

Question 23

Real image is formed by…

Answer 23

a convex lens is the object is further away than the principal focus

Question 24

Virtual image is formed by…..

Answer 24

a convex image is the object is nearer then the principal focus

Question 25

Position and nature of image formed by lens depends on… (2)

Answer 25

• focal length of lens

- distance from object to the lens

Question 26

What lens does a camera contain?

Answer 26

convex lens used to form real images of objects

Question 27

Image formed by a concave lens is always…

Answer 27

virtual, upright and smaller then object

Question 28

Real image formed by a convex lens is always…

Answer 28

real, inverted and enlarged then object

Question 29

Virtual image formed by a convex lens is always…

Answer 29

virtual, upright, larger then object