CAIE IGCSE Physics 3.2.4 Dispersion of Light Topic Practice

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Covered syllabus points

3.2.4.1—Dispersion of light as illustrated by3.2.4.2—Traditional seven colours of the3.2.4.3—Recall that visible light of a single

Question 1

[Maximum number: 2]

Fig. 6.3 shows yellow light passing through a glass prism.

Fig. 6.3

Fig. 6.3

Blue light enters the prism along the same path as the yellow light.
On Fig. 6.3, draw the path of the blue light as it enters, passes through and leaves the prism.

Question 2

[Maximum number: 4]

Question (a)

(a)

Fig. 6.1 shows white light incident at point X on a glass prism.

Fig. 6.1

Fig. 6.1

[ 3 ]

Question (i)

(i)

From point X on Fig. 6.1, draw a ray of red light, labelled R and a ray of violet light, labelled V, to show how a spectrum is formed on the screen.

[ 2 ]

Question (ii)

(ii)

State the colour of light in the visible spectrum with the shortest wavelength.

[ 1 ]

Question (b)

(b)

The critical angle for a type of glass is 42∘42^{\circ}.

Fig. 6.2 and Fig. 6.3 show two prisms ABC and PQR made of this type of glass. A ray of monochromatic red light passes into each of the prisms.

Fig. 6.2

Fig. 6.2

Fig. 6.3

Fig. 6.3

[ 1 ]

Question (i)

(i)

State what is meant by monochromatic light.

[ 1 ]

Question 3

[Maximum number: 1]

Fig. 5.1 shows a block ABCD made of glass that has a refractive index of 1.5. The block has one curved side AB and three straight sides, BC, CD and DA.

Fig. 5.1

Fig. 5.1

There are right angles at C and D. The curved side AB is one quarter of the circumference of a circle that has its centre at point P.

A ray of monochromatic light enters the block through the curved side AB and strikes side BC at P. Some light emerges into the air and some is reflected.

State what is meant by monochromatic.

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