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Physicss Physics A Level Physics Home Revision hut
Ray Diagrams
The red rays are VIRTUAL rays and are the real rays extended backwards
An inverted, diminished,
 real Image is produced
An inverted, magnified, real image is produced
The next section deals with reflection
In curved mirrors
In Fig 2 the object is between F and 2F. The image Is further away, Enlarged, inverted and real
It is possible to predict the size and position of of an
image in a convex lens by constructing  an accurate ray
 diagram
In Fig 1 the object is at 2F. The image is at 2F on the other side,same size as the image, inverted, same distance away and real.
Play the diagrams
Fig. 1
Fig. 2
In Fig.3 the object is beyond 2F. The image is nearer,diminished, inverted and real
Fig 3
In Fig 4 the image is between F and the lens. This time the rays will not meet behind the lens so they have to be extended back in front of the lens (same side as the object). They meet and produce a magnified, upright, virtual image. Fig4
A real image is on the opposite side of the lens to the object
 and can be projected onto a screen and is formed by real
rays
 A virtual image is on the same side as the object and cannot
 be projected. Virtual images are formed by virtual rays
Concave mirror