Alternative A

Question 2A

You are provided with a metre rule, lens, screen, ray box and other necessary apparatus.
(i)        Set up the experiment as shown in the diagram above.  Measure and record the diameter a0 of the illuminated object.
(ii)       Place the object at a distance x = 25 cm from the lens.  Adjust the screen until a sharp image is obtained on the screen.
(iii)      Measure and record the diameter, a, of the image.
(iv)      Measure and record the distance v between the lens and the screen.