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Light — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSLight3 Marks
Question
(a) What do you understand by the term lateral inversion?
(b) A printed card has letters PHYSICS. By drawing the diagram show the appearance of the letters. (No ray diagram is required).
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Answer

(a) Lateral Inversion. The phenomenon due to which the image of an object turns through an angle of $180^{\circ}$ through verticle axis rather the horizontal axis, such that right side of image appears as left or vice-versa is called Lateral Inversion. During lateral inversion the left side of object appears as right side of image and vice-versa. In a way the image turns through the angle of $180^{\circ}$ about vertical axis.
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