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Study > Light > Flashcards

Light Flashcards

1
Q

What is a light source?

A

Something that emits light

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2
Q

How does light reach our eyes from a book?

A

It reflects from the page into our eye

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3
Q

A luminous object _____ light

A

gives out

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4
Q

Objects that transmit light are called…

A

transparent

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5
Q

Light does not travel through _______ materials

A

opaque

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6
Q

Light can travel through translucent materials but it is…

A

scattered

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7
Q

Non luminous object _______ light

A

reflects

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8
Q

How fast is the speed of light?

A

300,000km/s

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9
Q

Light can travel through an empty space which is called a…

A

vacuum

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10
Q

Light travels as a…

A

wave

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11
Q

The ray that hits the mirror is called…

A

the incident ray

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12
Q

The ray that reflects from the mirror is called…

A

the reflected ray

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13
Q

The imaginary 90 degree line line to the mirror is called…

A

The normal

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14
Q

The angle between the incident ray and the normal is called…

A

The angle of incidence

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15
Q

The angle between the normal and the reflection ray is called…

A

The angle of reflection

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16
Q

True or false, the angle if incidence is always equal to the angle of reflection

A

True

17
Q

If the angle of incidence is 30 degrees, what is the angle of reflection?

A

30 degrees

17
Q

Reflection on a smooth surface is called…

A

specular reflection

17
Q

When light enters into glass or water, it _____ ____

A

Slows down

17
Q

Reflection on a rough surface is called…

A

diffuse reflection

18
Q

In each of our eyes, we have a _____ to focus on the incoming light

A

lens

19
Q

When rays of light travel through a convex lens they are bent and cross at the…

A

focal point

20
Q

The distance from the middle of the lens to the focal point is…

A

focal length

21
Q

The size of the pupil is called the…

A

iris

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