| http://www.w3.org/ns/prov#value | - In this case, as understood from the formula (31), the effect of reducing the astigmatism generated at the transparent plate 67 and the dichroic mirrors 68, 69 of the color synthesizing optical system shown in FIG. 5 for example by the square of the virtual image magnification m of the second lens group (64, 65, 66) can be obtained.
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