Draw two lines starting from the same point (usually the top) of an object , One line is straight and passes through the centre of the lens; the other runs parallel to the principal axis until reaching the lens, then bends and goes through the focal point, Since the image is real, it is formed at the point where both lines meet

Draw two lines starting from the same point (usually the top) of an object , One line is straight and passes through the centre of the lens; the other runs parallel to the principal axis until reaching the lens, then bends and goes through the focal point, Draw two dashed lines (one for each line drawn) that go backwards, Since the image is virtual, the image is formed at the point where the dashed lines meet

Draw two lines starting from the object, One line should be straight and pass through the centre of the lens; the other should run parallel to the principal axis, then bend diagonally upwards after reaching the lens, Then draw a dashed line backwards to the focal point, from the ray that has bent upwards, The image is formed at the point where the rays appear to meet

Larger (taller) than the object - only occurs for converging lenses, when the object is nearer than the focal point to the lens, Smaller (shorter) than the object, Real - Image forms where the rays actually meet (not where dashed lines meet), Virtual - Image forms where the rays appear to meet (where the dashed lines meet), Inverted - Image forms on opposite side of principal axis to the object, Upright - Image forms on same side of principal axis to the object