Quelpr
1 markImage Formation

CSEC Physics · January 2018 · Paper 2 · Question 5(b)(iv)

A homemade projector is constructed from a cardboard box, a cellphone, a cellphone stand, and a magnifying glass embedded into one face of the box, as shown in Figure 5. The focal length of the lens is 15.0 cm.

If the dimensions of the phone screen are 11.0 cm × 6.0 cm, calculate the dimensions of the image of the phone screen on the external screen.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 5(a)State what evidence each proposed and whether this evidence supported the wave theory or particle theory.[4 marks]
  2. 5(b)(i)Suggest, with a reason, an appropriate distance from the lens at which the phone should be placed in order to get a magnified image on an external screen.[2 marks]
  3. 5(b)(ii)If the phone is placed 20 cm from the lens, calculate the distance the screen must be placed from the lens in order to obtain a clear image of the phone.[3 marks]
  4. 5(b)(iii)Calculate the magnification of the image on the external screen formed in (b)(ii).[3 marks]
  5. 5(b)(v)State whether the image formed in (b)(ii) is upright or inverted.[1 mark]
  6. 5(b)(vi)Suggest one way in which the image formed in (b)(ii) can be made larger.[1 mark]

More practice: the rest of this paper · more Image Formation questions · all CSEC Physics past papers