3.2 Light Flashcards

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1
Q

What happens when rays of light hit a plane mirror?

A

They are reflected.

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2
Q

What are the characteristics of an image formed from a plane mirror?

A

• The same size as the object
• On the the same side of the mirror as the object
• An inverted (upside down) version of the obiect

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3
Q

When light is reflected how do angles i and r compare?

A

angle of incidence = angle of reflection

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4
Q

How are the angles of incidence and reflection measured?

A

Relative to the normal.

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5
Q

What is a virtual image?

A

An image produced on the same side of the lens as the object.

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6
Q

What is a real image?i

A

• An image produced on the opposite side of the lens from the obiect.
• A real image can be formed on a screen as the light rays cross after the ens.

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7
Q

What kind of image is produced by a plane mirror?

A

A virtual image

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8
Q

What is refraction?

A

Refraction is the change in speed of a wave crossing a boundary between two media, resulting in a change in direction.

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9
Q

Which property of a wave is not changed by refraction?

A

The frequency

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10
Q

What is the critical angle?

A

The angle of incidence which produces an angle of refraction of 90°.

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11
Q

What is internal reflection?

A

When light reaches a boundary and is reflected back into the medium which it came from.

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12
Q

What is total internal reflection?

A

When a ray of light is fully reflected back into the medium it came from, when reaching a boundary between media.

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13
Q

When does total internal reflection occur?

A

When the angle of incidence is greater than the critical angle.

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14
Q

Define refractive index

A

The ratio of the speed of light in a vacuum to the speed of light in any given medium.

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15
Q

Give the equations for refractive index

A

refractive index = sin(i) / sin(r)

refractive index = 1 / sin(i)

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16
Q

When light passes through a converging lens..

A

The light rays bend towards the normal, and meet at a focal point.

17
Q

What is the principal focus of a lens?

A

A focal point before a convex lens, from which the light rays appear to come from, or the focal point after a concave lens where all the rays meet.

18
Q

How can lenses act as magnifying glasses?

A

By producing an enlarged, virtual image.

19
Q

How does wavelength affect refraction?

A

Shorter wavelength waves refract more.

20
Q

What happens when white light is shone through a prism?

A

It separates into a spectrum of all its coloured light components.

21
Q

List, in the correct order, the spectrum of colours produced by the dispersion of white light

A

Red, orange, yellow, green, blue, indigo and violet.

22
Q

What is monochromatic light?

A

Light of a single frequency.