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Physics · Oct / Nov 2023 · Paper 41 · Question 6

0625

As printed in the paper

The question as text

A page of printed text is placed 18 cm from a converging lens of focal length 35 cm. Fig. 6.1 is a scale diagram of the arrangement with each of the two principal focuses (focal points) of the lens labelled F. 18 cm page of printed text F F 5.0 cm 5.0 cm lens Fig. 6.1

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  • 6(a)(i)[3]

    any two from:

    ray from top / bottom of object, parallel to principal axis, refracted through right-hand principal focus
    straight ray from same point on object through optical centre
    ray that (seems to) come from left-hand principal focus through same point of object and refracted parallel to principal axis

    rays traced back to intersection AND intersection / image labelled I

  • 6(a)(ii)[2]

    (distance = ) 35.5 cm to 38.5 cm

    7.1 to 7.7 (cm) OR (distance =) 35.0 (cm) to 40.0 (cm)

  • 6(b)[1]

    virtual AND any one from:

    cannot be projected on a screen
    (real) light (ray) does not pass through image
    light only seems to come from image

  • 6(c)[2]

    any one from:

    long-sightedness focuses image behind retina / back of eye OR longsightedness produces blurry / fuzzy images (of close objects)
    converging lens reduces focal length (of eye)
    (converging lens) puts image further away (from the eye)

    (converging lens gives) sharp/focussed image on retina / back of eye OR (with lens) rays converge on retina / back of eye

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