DP Physics (last assessment 2024)

Test builder »

Question 18N.3.SL.TZ0.8

Select a Test
Date November 2018 Marks available [Maximum mark: 5] Reference code 18N.3.SL.TZ0.8
Level SL Paper 3 Time zone TZ0
Command term Draw, Hence, Label, State, Suggest Question number 8 Adapted from N/A
8.
[Maximum mark: 5]
18N.3.SL.TZ0.8

The refractive index of glass decreases with increasing wavelength. The diagram shows rays of light incident on a converging lens made of glass. The light is a mixture of red and blue light.

(a)

On the diagram, draw lines to show the rays after they have refracted through the lens. Label the refracted red rays with the letter R and the refracted blue rays with the letter B.

[3]

Markscheme

each incident ray shown splitting into two ✔

each pair symmetrically intersecting each other on principal axis ✔

for red, intersection further to the right ✔

For MP3, at least one of the rays must be labelled.

(b.i)

Suggest how the refracted rays in (a) are modified when the converging lens is replaced by a diverging lens.

[1]

Markscheme

rays diverge after passing through lens

OR

the extension of the rays will intersect the principal axis on the side of incident rays/as if they were coming from the focal point/points in the left side/OWTTE ✔

(b.ii)

Hence state how the defect of the converging lens in (a) may be corrected.

[1]

Markscheme

by placing a diverging lens next to the converging lens

OR

make an achromatic doublet ✔

Syllabus sections