Properties of Image in a Plane Mirror : āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋā§° āĻŦā§āĻļāĻŋāώā§āĻā§āϝ
- The image formed by a plane mirror is virtual. āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻ ā§ąāĻžāϏā§āĻ¤ā§ą (Virtual) āĻšāϝāĻŧāĨ¤
- The image formed by a plane mirror is erect. āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻĨāĻŋāϝāĻŧ (Erect) āĻšāϝāĻŧāĨ¤
- The image formed by a plane mirror is the same size as the object. āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋā§° āĻāĻāĻžā§° āĻŦāϏā§āϤā§ā§° āϏāĻŽāĻžāύ āĻšāϝāĻŧāĨ¤
- The image is formed at the same distance behind the mirror as the object is in front of the mirror. āĻŦāϏā§āϤ⧠āĻĻāĻžāĻĒā§āύ⧰ āĻāĻāĻĢāĻžāϞāϤ āϝāĻŋāĻŽāĻžāύ āĻĻā§ā§°āϤ āĻĨāĻžāĻā§, āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻĻāĻžāĻĒā§āύ⧰ āĻĒāĻŋāĻāĻĢāĻžāϞāϤ āĻ āĻŋāĻ āϏāĻŋāĻŽāĻžāύ āĻĻā§ā§°āϤ āĻāĻ āύ āĻšāϝāĻŧāĨ¤
- The image formed by a plane mirror is laterally inverted. āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻĒāĻžā§°ā§āĻļā§āĻŦā§āϝāĻŧāĻāĻžā§ąā§ āĻāϞā§āĻāĻž (Laterally Inverted) āĻšāϝāĻŧ, āĻ ā§°ā§āĻĨāĻžā§ āĻŦāĻžāĻāĻ āĻā§°ā§ āϏā§āĻ āĻĢāĻžāϞ āϏāϞāύāĻŋ āĻĻā§āĻāĻž āϝāĻžāϝāĻŧāĨ¤
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MCQs
1. The image formed by a plane mirror is: āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻā§āύā§āϧ⧰āĻŖā§° āĻšāϝāĻŧ ?
A) Real | B) Virtual | C) Both Real and Virtual | D) Magnified
Ans: B) Virtual
Explanation: A plane mirror always forms a virtual image because the reflected rays do not actually meet. āĻŦā§āϝāĻžāĻā§āϝāĻž: āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύ⧠āϏāĻĻāĻžāϝāĻŧ āĻ ā§ąāĻžāϏā§āĻ¤ā§ą āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻāĻ āύ āĻā§°ā§, āĻāĻžā§°āĻŖ āĻĒā§ā§°āϤāĻŋāĻĢāϞāĻŋāϤ āĻāĻŋā§°āĻŖāϏāĻŽā§āĻš āĻŦāĻžāϏā§āĻ¤ā§ąāϤ⧠āĻŽāĻŋāϞāĻŋāϤ āύāĻšāϝāĻŧāĨ¤
2. The image formed by a plane mirror is: āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻā§āύ⧠āĻšāϝāĻŧ ?
A) Inverted | B) Erect | C) Upside down | D) Rotated
Ans: B) Erect
Explanation: The image formed by a plane mirror is always upright (erect). āĻŦā§āϝāĻžāĻā§āϝāĻž: āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āϏāĻĻāĻžāϝāĻŧ āĻĨāĻŋāϝāĻŧ āĻšāϝāĻŧāĨ¤
3. The size of the image formed by a plane mirror is: āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋā§° āĻāĻāĻžā§° āĻā§āύ⧠āĻšāϝāĻŧ ?
A) Larger than the object | B) Smaller than the object | C) Same as the object â | D) Depends on the distance
Ans: C) Same as the object
Explanation: A plane mirror always forms an image of the same size as the object. āĻŦā§āϝāĻžāĻā§āϝāĻž: āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋā§° āĻāĻāĻžā§° āϏāĻĻāĻžāϝāĻŧ āĻŦāϏā§āϤā§ā§° āϏāĻŽāĻžāύ āĻšāϝāĻŧāĨ¤
4. The image in a plane mirror is formed: āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻ'āϤ āĻāĻ āύ āĻšāϝāĻŧ ?
A) At the pole | B) In front of the mirror | C) Behind the mirror at the same distance as the object | D) At infinity
Ans: C) Behind the mirror at the same distance as the object
Explanation: The image is formed behind the mirror at a distance equal to the object's distance in front of the mirror. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻĻāĻžāĻĒā§āύ⧰ āĻĒāĻŋāĻāĻĢāĻžāϞā§, āĻŦāϏā§āϤ⧠āĻāĻāĻĢāĻžāϞ⧠āĻĨāĻāĻž āĻĻā§ā§°āϤā§āĻŦā§° āϏāĻŽāĻžāύ āĻĻā§ā§°āϤā§āĻŦāϤ āĻāĻ āύ āĻšāϝāĻŧāĨ¤
5. The image formed by a plane mirror is laterally inverted. This means: āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻĒāĻžā§°ā§āĻļā§āĻŦā§āϝāĻŧāĻāĻžā§ąā§ āĻāϞā§āĻāĻžāĨ¤ āĻāϝāĻŧāĻžā§° āĻ ā§°ā§āĻĨ āĻāĻŋ ?
A) Top and bottom are interchanged | B) Left and right are interchanged | C) The image is upside down | D) The image becomes smaller
Ans: B) Left and right are interchanged
Explanation: Lateral inversion means the left side appears as the right side and the right side appears as the left side. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻĒāĻžā§°ā§āĻļā§āĻŦā§āϝāĻŧ āĻāϞā§āĻāĻž (Laterally Inverted) āĻ ā§°ā§āĻĨ āĻšā§āĻā§ āĻŦāĻžāĻāĻāĻĢāĻžāϞ āϏā§āĻāĻĢāĻžāϞ āĻā§°ā§ āϏā§āĻāĻĢāĻžāϞ āĻŦāĻžāĻāĻāĻĢāĻžāϞ āĻšāĻŋāĻāĻžāĻĒā§ āĻĻā§āĻāĻž āϝāĻžāϝāĻŧāĨ¤
6. Which one of the following is NOT a property of the image formed by a plane mirror ? āϤāϞ⧰ āĻā§āύāĻā§ āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύāϤ āĻāĻ āĻŋāϤ āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋā§° āĻŦā§āĻļāĻŋāώā§āĻā§āϝ āύāĻšāϝāĻŧ ?
A) Virtual | B) Erect | C) Same size | D) Real
Ans: D) Real
Explanation: A plane mirror never forms a real image; it always forms a virtual image. āĻŦā§āϝāĻžāĻā§āϝāĻž: āϏāĻŽāϤāϞ āĻĻāĻžāĻĒā§āύ⧠āĻā§āϤāĻŋāϝāĻŧāĻžāĻ āĻŦāĻžāϏā§āĻ¤ā§ą āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻāĻ āύ āύāĻā§°ā§; āĻ āϏāĻĻāĻžāϝāĻŧ āĻ ā§ąāĻžāϏā§āĻ¤ā§ą āĻĒā§ā§°āϤāĻŋāĻā§āĻāĻŦāĻŋ āĻāĻ āύ āĻā§°ā§āĨ¤
Trick
Plane Mirror = VESDL
- V = Virtual (āĻ ā§ąāĻžāϏā§āĻ¤ā§ą)
- E = Erect (āĻĨāĻŋāϝāĻŧ)
- S = Same Size (āϏāĻŽāĻžāύ āĻāĻāĻžā§°)
- D = Same Distance Behind the Mirror (āϏāĻŽāĻžāύ āĻĻā§ā§°āϤā§āĻŦ)
- L = Laterally Inverted (āĻŦāĻžāĻāĻ–āϏā§āĻ āĻāϞā§āĻāĻž)