Topic Menu

Cyber-chess a chess instruction site

GCSE level optics questions

Q12.

The diagram shows a plane mirror used by a dentist to see the back of a patient's tooth.

 

(a) Use a ruler to draw a ray of light on the diagram to show how the dentist is able to see the tooth labelled Z.

Marks were awarded as follows:

ray drawn from tooth to mirror to eye

angle I = angle R judged by eye

at least one arrow head drawn in the correct direction - conflicting arrows got no mark

If no ruler was used the maximum mark was 2

(3 marks)

(b) Describe the image formed by a plane mirror.

The image is virtual, the same size as the object and upright

It will be formed as far behind the mirror as the object is in front - but that is the position of the image formed not a property of it.

(3 marks)

(Total 5 marks)