Electromagnetic waves

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Question 14
Easy
a.

State the term used for the distance between the principal focus and the optical centre of a lens.

[1]
b.

Explain one difference between a real image and a virtual image formed by a lens.

[1]
c.

An engineer uses a magnifying lens to inspect a trace on a circuit board.

  • The image height of the trace is 13.5 mm.
  • The magnification produced by the lens is 4.5.

Calculate the actual height of the trace. Use the equation:

magnification=image heightobject height \text{magnification} = \frac{\text{image height}}{\text{object height}} magnification=object heightimage height​
[2]

Electromagnetic waves Questions

  1. GCSE
  2. /Physics
  3. /Electromagnetic waves