If a water surface is placed along line M–N as shown, which option is the…
2026
If a water surface is placed along line M–N as shown, which option is the water image of the given figure?
Answer: D. Inverted triangle; striped region at upper-left and rectangular blocks at upper-right. — ConceptA water image is a reflection across a horizontal line. Every point keeps the same left–right position and appears at the same perpendicular distance…
- A.
Upright triangle; striped region at lower-left and rectangular blocks at lower-right.
- B.
Inverted triangle; striped region at upper-right and rectangular blocks at upper-left.
- C.
Upright triangle; striped region at lower-right and a rectangular block at lower-left.
- D.
Inverted triangle; striped region at upper-left and rectangular blocks at upper-right.
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Show answer & explanation
Correct answer: D
Concept
A water image is a reflection across a horizontal line.
Every point keeps the same left–right position and appears at the same perpendicular distance on the opposite side; only top and bottom are interchanged.
Application
The triangle’s apex is above line M–N, so its image must have the apex pointing downward.
The striped compartments at the lower-left move to the upper-left, while the rectangular blocks at the lower-right move to the upper-right.
The black band above these lower compartments moves below the corresponding reflected parts, while left and right remain unchanged.
Cross-check
Compare paired landmarks: the striped pattern remains on the left and the rectangular blocks remain on the right, both at vertically reversed heights.
Therefore, the water image is the inverted triangle whose striped section is at the upper-left and rectangular blocks are at the upper-right.