
Concept explainers
Interpretation :
The requirement to superimpose the mirror image of letter ‘D’ with the original letter must be explained.
Concept Introduction :
An unsymmetrical object will look different in mirror. There will be partial change due to reflection.

Answer to Problem 1E
The mirror image of letter ‘D’ must be rotated 180° in horizontal plane to superimpose with the original letter.
Explanation of Solution
The letter ‘D’ is not symmetric and so there will be partial change due to reflection in the mirror. If the mirror image is rotated 180° in horizontal plane then this new image will look like the original letter ‘D’. Now these two can be superimposed. It is shown below.
Mirror image of letter ‘D’ and 180° rotated image in horizontal plane are shown.
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