Optics | Edexcel GCSE Physics Paper 1 2018

1a

1 mark

Figure 1 shows light waves passing from air into glass.

wavefronts

Figure 1

Which effect is shown in the diagram?

$□$ A Dispersion

$□$ B Diffraction

$□$ C Refraction

$□$ D Reflection

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1b

2 marks

State two ways in which the light waves change as they pass from the air into the glass.

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1c

2 marks

On Figure 1:

i)

Draw the normal to the incident ray.

[1]

ii)

Label the angle of incidence on the diagram.

[1]

wavefronts

Figure 1

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1a1 mark

This question is about light.

White light includes all the colours in the visible spectrum.

A beam of white light is the only light that shines on a book.

The book appears green.

A red filter is placed between the source of white light and the book.

What colour does the book appear now?

☐	A	black
☐	B	blue
☐	C	green
☐	D	red

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1b3 marks

Figure 8 shows a shiny metal ball.

fig-8-paper1f-oct2021-edexcel-gcse-physics
Figure 8

A clear image of a building can be seen on the surface of the ball.

i)

This clear image is an example of

☐	A	diffuse reflection
☐	B	diffuse refraction
☐	C	specular reflection
☐	D	specular refraction

[1]

ii)

Explain why the surface of the metal ball gives a clear image.

You may draw diagrams to help with your answer.

[2]

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1c3 marks

Figure 9a and Figure 9b show rays of light before and after passing through different lenses.

i)

State one similarity and one difference in the way the rays of light pass through the lenses.

[2]

similarity........................................................................................................................

difference......................................................................................................................

ii)

Figure 10 shows two glass lenses P and Q.

fig-10-paper1f-oct2021-edexcel-gcse-physics
Figure 10

State how the power of P is different from the power of Q.

[1]

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1d6 marks

Figure 11a shows refraction of light at a boundary between glass and air.

Figure 11b shows total internal reflection of light at a boundary between glass and air.

Use Figure 11a and Figure 11b to explain refraction and total internal reflection.

You may add to Figure 11a and Figure 11b to help with your answer.

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1a4 marks

A student is investigating the refraction of light.

Figure 5 shows part of the apparatus and the angles to be measured.

fig-5-paper1h-oct2021-edexcel-gcse-physics

Figure 5

The student measures angle r for several different values of angle i.

Figure 6 shows the student’s results.

fig-6-paper1h-oct2021-edexcel-gcse-physics

Figure 6

i)

On the graph in Figure 6, draw the best fit curve.

[1]

ii)

Use the graph in Figure 6 to estimate the value of angle r when angle i is 80°.

[1]
angle r = .............................................................°

iii)

Describe how angle r changes with angle i for the results shown on the graph in Figure 6.

[2]

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1b1 mark

Higher Only

In Figure 5, the frequency of the light remains the same in glass as in air.

Which row of the table describes what happens to the wave velocity and to the wavelength of the light when the light travels from air to glass?

		wave velocity	wavelength
☐	A	decreases	decreases
☐	B	decreases	increases
☐	C	increases	decreases
☐	D	increases	increases

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1c3 marks

In Figure 7, only refraction of light is shown.

Other things happen to the light as it travels from P to Q.

The intensity (brightness) of the light at Q is less than the intensity of the light at P.

fig-7-paper1h-oct2021-edexcel-gcse-physics

Figure 7

Explain the decrease in intensity as the light travels from P to Q.

You may add to Figure 7 to help your answer.

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1d1 mark

Higher Only

Which of these sketch graphs represents the speed of light as it travels from P to Q?

8kiZ12pT_q5d-paper1h-oct2021-edexcel-gcse-physics

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	Download	View
Easy
Medium
Hard

	Lens	Image
$□$ A	converging	real
$□$ B	converging	virtual
$□$ C	diverging	real
$□$ D	diverging	virtual

	Lens	Image
$□$ A	diverging	virtual
$□$ B	converging	virtual
$□$ C	converging	real
$□$ D	diverging	real

Edexcel GCSE Physics

Topic Questions

5.1 Optics

Higher Only

Higher Only

☐	A	converging lens forming a real image
☐	B	diverging lens forming a real image
☐	C	converging lens forming a virtual image
☐	D	diverging lens forming a virtual image

☐	A	blue-shifted
☐	B	green-shifted
☐	C	red-shifted
☐	D	violet-shifted

☐	A	Earth
☐	B	Milky way Galaxy
☐	C	Solar System
☐	D	Universe