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Question 19N.2.HL.TZ0.10c(i)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.HL.TZ0.10c(i)
Level HL Paper 2 Time zone TZ0
Command term Draw Question number c(i) Adapted from N/A
c(i).
[Maximum mark: 2]
19N.2.HL.TZ0.10c(i)

The lens of an optical system is coated with a thin film of magnesium fluoride of thickness d. Monochromatic light of wavelength 656 nm in air is incident on the lens. The angle of incidence is θ. Two reflected rays, X and Y, are shown.

The following refractive indices are available.

Air                            = 1.00
Magnesium fluoride = 1.38
Lens                         = 1.58

Light from a point source is incident on the pupil of the eye of an observer. The diameter of the pupil is 2.8 mm.

(c(i))

Draw, on the axes, the variation with diffraction angle of the intensity of light incident on the retina of the observer.

[2]

Markscheme

standard single slit diffraction pattern with correct overall shape ✔

secondary maxima of right size ✔

 

NOTE: Secondary maximum not to exceed 1/5th of maximum intensity

Ignore width of maxima

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