Science - Optics

Question 1

Refraction

Answer 1

Change in direction of light as it travels from one material to another

Question 2

Incident Ray

Answer 2

Ray of light that arrives at a mirror or enters a substance

Question 3

Specular reflection

Answer 3

Reflection off smooth surfaces ( glassy water )

Question 4

Diffuse reflection

Answer 4

Reflection of light off an uneven surface ( results in light scattering in many directions )

Question 5

Reflected Ray

Answer 5

Light that bounces off the surface

Question 6

Non-luminous

Answer 6

Objects that do not give out light, but may reflect it, most objects on earth are non-luminous ( moon )

Question 7

Law of reflection

Answer 7

The angle of incidents is always equal to the angle of reflection

Question 8

Shadow

Answer 8

Area of reduced light created whenever an opaque object blocks the path of light

Question 9

What makes objects appear certain colours

Answer 9

When the object absorbs all the colours except for the one you see that one is reflected

Question 10

Penumbra

Answer 10

The partially shaded region of a shadow, formed by some light passing through an opaque object ( edge)

Question 11

Umbra

Answer 11

The fully shaded region of a shadow ( darkest )

Question 12

Opaque

Answer 12

Describes materials that do not allow light to pass through ( wood, metal )

Question 13

Luminous

Answer 13

Objects that give out light ( sun, fire, lightbulb )

Question 14

Normal

Answer 14

Line perpendicular to a surface (90° angle with surface)

Question 15

Angle of reflection

Answer 15

Angle between the reflected ray and the normal

Question 16

Angle of incidents

Answer 16

Angle between the incoming ray and the normal

Question 17

Transparent

Answer 17

Describe materials that allow light to pass through with little or no reflection

Question 18

Translucent

Answer 18

Describes materials that allow some light to pass through