P4

Question 1

Wave speed

Answer 1

The distance travelled by a wave each second(m/s)

Question 2

Frequency

Answer 2

The number of waves passing a point in a second(Hz)

Question 3

Wavelength

Answer 3

The distance from one point on the wave to the same point on the next wave(metres)

Question 4

Amplitude

Answer 4

The distance from the undisturbed position to the peak or trough of a wave(metres)

Question 5

Principle Axis

Answer 5

Line which passes through the centre of a lens

Question 6

Principle focus/ focal point

Answer 6

Point at which rays of light travelling parallel to the principal axis intersect the principal axis and converge

Question 7

Focal length

Answer 7

distance from the centre of the lens and principal focus

Question 8

Real image properties

Answer 8

-A real image is one produced by the convergence of light towards a focus
-Real images are always inverted
-Real images can be projected onto pieces of paper or screens

Question 9

Virtual image properties

Answer 9

-A virtual image is formed by the divergence of light away from a point
-Virtual images are always upright
-Virtual images cannot be projected onto a piece of paper or a screen

Question 10

Critical angle

Answer 10

Angle of incidence where refracted ray diagram disappears into interface

Question 11

Virtual Image definition

Answer 11

An image that is formed when light rays from an object do to meet but appear to meet behind the lens and cannot be projected onto a screen

Question 12

Real Image definition

Answer 12

An image that is formed when the light rays from an object converge and meet each other and can be projected onto a screen.