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Physics Paper 2 > P14: Light > Flashcards

P14: Light Flashcards

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1
Q

How do lenses form images?

A

By refracting light

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2
Q

What happens in convex lenses?

A

Parallel rays of light are brought to a focus at the principle focus.

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3
Q

What is the focal length?

A

The distance from the lens to the principle focus

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4
Q

What kind of image is produced by a convex lens?

A

Real or virtual

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5
Q

What kind of image is produced by a concave lens?

A

Always virtual

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6
Q

What is specular reflection?

A

Reflection from a smooth surface in a single direction

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7
Q

What is diffuse reflection?

A

Reflection from a rough surface, causing scattering

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8
Q

How do colour filters work?

A

By absorbing certain wavelengths (and colour) and transmitting other wavelengths (and colour)

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9
Q

When is an object white?

A

When all wavelengths are reflected equally

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10
Q

When is an object black?

A

When all wavelengths are absorbed equally

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11
Q

Which colour has the longest wavelength?

A

Red

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12
Q

Which colour has the shortest wavelength?

A

Violet

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13
Q

What does the colour an object appear to be depend on?

A

The wavelength of light hitting it and the property of the object

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14
Q

What are opaque objects?

A

Those that don’t transmit any light

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15
Q

What 2 colours should be reflected to form yellow?

A

Red and green

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16
Q

What are transparent objects?

A

Those that transmit most light, with a small amount being absorbed

17
Q

What is another name for a convex lens?

A

Converging lens

18
Q

What does a converging lens do?

A

It refracts parallel rays of light inwards to a single point (principle focus)

19
Q

What does it mean if the focal length is short?

A

The lens is more powerful as it refracts light more strongly

20
Q

How would you make a lens more powerful?

A

Use a different material or make the lens more curved

21
Q

What is the difference between a real image and an imaginary image?

A

Real image is formed when rays cross but virtual image is where virtual rays cross. Virtual image is where rays seem to come from

Physics Paper 2 (9 decks)

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