When the word HIDE is reflected in a horizontal line, the image is still HIDE. Can you think of the other words that are unchanged when reflected in a horizontal line?
When BOOK is reflected horizontally, the image is still same as BOOK.
When word HIDE is reflected horizontally, the image is still HIDE.
When B is reflected horizontally it remains B itself.
Similarly, when O and K are reflected horizontally the image will be O and K. Now, “BOOK” can be constructed using B, O and K.
Hence, here BOOK is reflected along the dotted line.
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