CAIE IGCSE Physics 3 Waves Questions

Covered syllabus points

3.1 General properties of waves 3.2.1 Reflection of light 3.2.2 Refraction of light 3.2.3 Thin lenses 3.2.4 Dispersion of light 3.3 Electromagnetic spectrum 3.4 Sound

[Maximum number: 1]

Which statement about waves is correct?

Waves do not transfer either energy or matter.

Waves transfer both energy and matter.

Waves transfer energy without transferring matter.

Waves transfer matter without transferring energy.

[Maximum number: 1]

A ray of light is reflected by a plane mirror.

Figure for Question 2 — CAIE IGCSE Physics

Which row shows the angle of incidence and the angle of reflection?

angle of

incidence

angle of

reflection

[Maximum number: 7]

Fig. 7.1 shows a container of oil.

Fig. 7.1

A ray of light shines on the surface of the oil. The refractive index of the oil is 1.47 .

(a)

On Fig. 7.1, draw the normal at the point where the ray enters the oil.

[ 1 ]

(b)

The angle x is $56^{\circ}$ .

Calculate the value of the angle of refraction.
angle of refraction =

[ 3 ]

$22^{\circ}$ $i=34\left({ }^{\circ}\right)$ $n=\sin i / \sin r \mathbf{O R}(r=) \sin ^{-1}\{\sin i / n\} \mathbf{O R} \sin r=\sin 34 / 1.47 \mathbf{O R} \sin r=0.38$

(c)

State the approximate speed of light in air.

[ 1 ]

$3.0 \times 10^{8} \mathrm{~m} / \mathrm{s}$

(d)

Calculate the speed of light in the oil.

Give your answer to three significant figures.

speed =

[ 2 ]

$2.04 \times 10^{8} \mathrm{~m} / \mathrm{s}$
n= speed of light in air / speed of light in oil

OR (speed of light in oil =) speed of light in air/n

OR (speed of light in oil = ) $3.0 \times 10^{8} / 1.47$

[Maximum number: 9]

Fig. 7.1 is a full-scale diagram of a small nail N in front of a thin converging lens. The line L represents the lens.

Fig. 7.1 (full scale)

The focal length of the lens is 3.0 cm .

(a)

Rays of light, parallel to XY , are travelling towards the lens.

Describe what happens to the light after it passes through the lens.

[ 3 ]

(b)

On Fig. 7.1, mark and label with an F each of the two principal focuses of the lens.

[ 1 ]

(c)

The small nail N , of height 1.2 cm , is positioned 2.0 cm to the left of the lens.

[ 5 ]

(i)

By drawing on Fig. 7.1, find the position of the image I of N and add image I to the diagram.

[ 3 ]

(ii)

State and explain whether I is a real or a virtual image.

[ 1 ]

(iii)

State the name given to a lens when it is used in this way.

[ 1 ]

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CAIE IGCSE Physics 3 Waves Topic Practice

Covered syllabus points

Question 1

Question 2

Question 3

Question (a)

Question (b)

Question (c)

Question (d)

Question 4

Question (a)

Question (b)

Question (c)

Question (i)

Question (ii)

Question (iii)