Complete the definition of the ‘principal focus’ of a lens.
The principal focus of a lens is a point on the principal axis where
6(b)Lenses Image FormationMedium3 marks
Figure 6.1 is a full-scale diagram of a converging lens and an object O.
The two points labelled F show the positions of the focal points.
On Figure 6.1, draw two rays to locate the position of the image. Label the image I.
PenEraserUndoRedoClear
Draw with the mouse or a finger.
6(c)Electromagnetic Spectrum ApplicationsEasy1 mark
Visible light is one region of the electromagnetic spectrum.
State the name of the region of the electromagnetic spectrum which has the lowest frequency.