Terms

Question 1

Light

Answer 1

Electromagnetic radiation that can be detected from the eye.

Question 2

Different types of electromagnetic radiation

Answer 2

Radio waves, microwaves, infrared light, visible light, ultraviolet light, X-rays, gamma rays.

Question 3

Speed of light

Answer 3

3.00 x 10 to the power of 8 m/s.

Question 4

Order of colour in the visible spectrum of light

Answer 4

Red, Orange, Yellow, Green, Blue, Indigo, Violet.

Question 5

Reflection

Answer 5

Reflection is the bouncing back of light from a surface.

Question 6

What are the Laws of Reflection?

Answer 6

The angle of incidence equals the angle of reflection.
The incident ray, the reflected ray, and the normal all lie in the same plane.

Question 7

Define and give an example of specular reflection and diffuse reflection

Answer 7

A specular reflection is the light off a smooth surface whereas diffuse reflection is the reflection of light on a dull surface.

Question 8

Define virtual image

Answer 8

A virtual image is an image formed by light from an apparent light source; meaning light is not arriving at or coming from the actual image location.

Question 9

Four characteristics used to describe an image

Answer 9

SALT -
size: smaller, same, larger.
attitude: inverted or upright.
location: at C, at F, between C and F, between F and 2F, behind mirror, behind lens, beyond C, beyond F.
type: real or virtual

Question 10

converge

Answer 10

to meet a common point. A mirror shaped like part of a sphere in which the inner surface is reflective.

Question 11

diverge

Answer 11

to spread apart. A mirror shaped like part of a sphere in which the outer surface is reflective.

Question 12

refraction

Answer 12

Refraction is the bending or change in direction of light when it changes from one medium into another, for example, when a spoon is placed in a glass of water the spoon may look disconnected from the glass however it is not.

Question 13

total internal reflection

Answer 13

Total internal reflection is when the angle of incidence is greater than the critical angle, for example, when the refracted ray disappears and only a reflected ray is visible.

Question 14

apparent depth

Answer 14

is the depth an object appears to be at whereas the real depth is the actual depth of an object.

Question 15

variables and meanings in a thin lens equation

Answer 15

do - distance from object to the optical centre.
di - distance from image to the optical centre.
f - focal length ; distance from the optical centre to the principal focus.

Question 16

Hyperopia

Answer 16

inability to see near objects a converging lens is best and would correct this focusing problem, positive meniscus.

Question 17

Myopia

Answer 17

inability to see distant objects, a diverging lens is best and would correct this focusing problem, negative meniscus.