Mirror Image: Types, Methods and Examples
Mirror image is a non-verbal reasoning topic in which a figure, a letter, a number or a word is given and the candidate must choose the correct reflection of it as it would appear in a mirror placed on one side. The mirror is usually placed on the right or on the left, and sometimes above or below, and the candidate must decide how the reflection will look.
This topic is asked in APSC, ADRE, Assam Police, DHS, DME, SSC and Railway examinations because it tests the ability to imagine a reflection without turning the real object. It uses only a few fixed rules, so once they are clear the topic becomes quick and accurate. This article gives a complete deep-study revision of mirror image: the basic terms, the core rules, the types of questions, the step-by-step method, the common mistakes and a practical preparation plan.
Basic Terms
- Mirror: a surface that reflects a figure and produces its image.
- Reflection: the image of a figure as seen in a mirror.
- Lateral inversion: the left-to-right reversal produced by a vertical mirror.
- Vertical mirror: a mirror placed on the right or the left of the figure.
- Horizontal mirror: a mirror placed above or below the figure, giving the water image.
- Axis: the line about which the reflection takes place.
- Symmetry: the property of a figure that looks the same on both sides of a line.
- Water image: the reflection produced when the mirror is placed below the figure.
- Object: the original figure that is placed before the mirror.
- Image distance: the distance of the image from the mirror, equal to that of the object.
- Image: the reflection of the object as seen in the mirror.
- Symmetric letter: a letter that looks the same on both sides of a line.
- Half of the figure: the part of the object that lies on one side of the mirror line.
Core Concepts and Rules
- A vertical mirror placed on the right or left reverses the figure from left to right.
- In a vertical mirror the top and the bottom of the figure do not change.
- Letters and numbers with vertical symmetry, such as A, H, I, M, O, T, U, V, W, X and Y, look almost the same in a vertical mirror.
- A horizontal mirror placed above or below reverses the figure from top to bottom and gives the water image.
- The image is as far behind the mirror as the object is in front of it.
- The object and its mirror image face each other, so the left side of the object appears on the left side of the image but turned around.
- Clock questions use the rule that the mirror time plus the real time equals twelve o'clock.
- Always compare the image with the object corner by corner before choosing.
- In a right-side mirror the left of the object appears nearest to the mirror in the image.
- A letter with only horizontal symmetry changes in a vertical mirror but stays the same in a water image.
Types of Mirror Image Questions
The first type gives a single figure and asks for its mirror image. The second type gives a letter, a number or a word and asks for the mirror image. The third type gives a clock and asks for the time shown in the mirror. The fourth type asks for the water image of a figure. The fifth type gives a figure with a mirror line drawn on the paper and asks which option shows the correct reflection about that line.
Steps to Solve a Mirror Image Question
First, note where the mirror is placed, on the right, on the left, above or below. Second, decide which direction the figure will be reversed, left to right or top to bottom. Third, take the most distinctive part of the figure and find where it will fall in the image. Fourth, build the image part by part using the reversal rule. Fifth, compare the image with the options and reject those in which any part is in the wrong place. Finally, choose the option that exactly matches the rule for the given mirror position.
Examination Trends
In competitive examinations mirror image usually carries two to four marks. Questions with a single figure or with a word are the most common, and clock questions appear regularly. Letters like A, H, I, M, O, T, U, V, W, X, Y and the digits 0, 3 and 8 are used often because they have vertical symmetry. Because the topic uses fixed rules and no calculation except in clock questions, a candidate who practises the reversal rule can answer these questions confidently in a short time.
Common Mistakes to Avoid
- Do not reverse the figure top to bottom when the mirror is on the right or the left.
- Do not reverse the figure left to right for a water image.
- Do not assume that every letter looks the same in a mirror; check each one.
- Do not forget the direction in which the object is facing.
- Do not confuse the mirror image with the water image.
- Do not choose the option that is only rotated instead of reflected.
How to Prepare This Topic
Begin by holding a small mirror beside a written word and watching how each letter changes; this makes the rule of lateral inversion clear. Then practise with figures, and later with numbers and words. After that, solve clock questions and time yourself. Keep a note of the letters and numbers that keep confusing you and revise them in short sessions.
A useful method is to write the letters of the alphabet in a row and mark which of them are unchanged in a vertical mirror and which in a horizontal mirror. Another method is to fold a paper along the mirror line and prick the figure to see the reflection. Daily practice of twenty questions for a few days makes the reversal rule automatic, and the same skill helps in paper cutting and figure analogy questions as well.
Quick Revision Tips
- Check where the mirror is before deciding the direction of reversal.
- Learn the list of letters and digits that are unchanged in a mirror.
- For a word, reverse the order of the letters as well as each letter.
- For a clock, subtract the time from twelve to get the mirror time.
- Do not accept a rotated figure as a mirror image.
- Compare the image and the object corner by corner.
Final Revision Note
In the final revision, write the alphabet and mark which letters change in a vertical mirror, in a horizontal mirror, in both, or in neither. Then take words and numbers and find their images in both kinds of mirror. For clocks, solve ten mirror-time questions until the subtraction becomes easy. This focused revision removes the confusion between rotation and reflection and makes mirror questions a quick source of marks.
Frequently Asked Questions
What is a mirror image in reasoning?
It is a non-verbal reasoning topic in which the reflection of a figure, letter, number or word in a mirror is found.
How does a vertical mirror change a figure?
A vertical mirror placed on the right or left reverses the figure from left to right, while the top and bottom stay the same.
What is a water image?
A water image is the reflection produced by a horizontal mirror placed below the figure; it reverses the figure from top to bottom.
How is a clock mirror question solved?
In a clock question the mirror time plus the real time equals twelve o'clock, so the mirror time is found by subtracting the real time from twelve.
Which exams ask mirror image questions?
APSC, ADRE, Assam Police, DHS, DME, SSC and Railway examinations ask mirror image questions in the non-verbal reasoning section.