5.1-5.11 Rays, Lens and Electromagnetic spectrum Flashcards

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1
Q

In ray diagrams what do arrows show?

A

The direction at which light is travelling

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2
Q

What is the normal?

A

An imaginary dashed line which is perpendicular to the surface and from which all angles are measured from

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3
Q

Which ray is the incident angle the angle of?

A

.The entering ray

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4
Q

Which ray is the reflected ray the angle of?

A

.The exiting ray

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5
Q

If entering a denser material what happens to the light ray?

A

It bends towards the normal

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6
Q

If entering a less dense material what happens to the light ray?

A

It bends away from the normal

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7
Q

What is the law of reflection?

A

When rays are reflected the angle of reflection is equal to the angle of incidence

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8
Q

What is the critical angle?

A

The angle at which total internal reflection begins to happen

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9
Q

What is total internal reflection?

A

When light is moving from a denser medium to a less dense one instead of being refracted all of the light is reflected

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10
Q

What’s the difference between specular and diffuse reflection?

A

.Specular is when light hits a smooth surface-diffuse is when light hits a rough surface and the incident ray s reflected at many angles

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11
Q

What do all of the colours together make up?

A

White light

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12
Q

True or False? Each colour has its own wavelength

A

True

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13
Q

What is the focal length?

A

Distance between lens and focal point

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14
Q

If you had a shorter focal length what happens to the power?

A

Greater power

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15
Q

What does a thicker lens do to focal length?

A

Shorter focal length

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16
Q

The thicker the lens the greater the …?

A

Power

17
Q

What are concave lens used to fix?

A

Short sightedness

18
Q

What are convex lenses used to fix?

A

Long sightedness

19
Q

What happens to the light in a concave lens?

A

Spreads light outwards

20
Q

What happens to light in convex lenses?

A

It focuses the light inwards

21
Q

Where do real images appear to come from?

A

The opposite side of the lens to the object

22
Q

Where do virtual images appear to come from?

A

The same side of the lens to the object