Tag: formation of image in a plane mirror

Quizzes (0) Questions (66)

Questions Related to formation of image in a plane mirror

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

Nature of the image formed by a plane mirror is :

  1. virtual and erect

  2. of the same size as the object

  3. laterally inverted

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is a duplicate of question 460107 testing the same concept. A plane mirror forms an image that is virtual, erect, laterally inverted, and same-sized. 'All of these' (option D) correctly identifies that all three listed properties apply simultaneously. This is a standard textbook question testing knowledge of plane mirror characteristics.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

A man stands 2 m infront of a plane mirror. The mirror is moved 1 m towards the man while the man moves 50 cm away from the mirror. What is the distance between the images of the man?

  1. $1 m$
  2. $0.5 m$
  3. $2 m$
  4. $3 m$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial object distance $= 2m$
Final object distance
$=2 m-1 m+0.5 m$
$=2.5 m$
The distance between the images of the man is 0.5 m.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

Two plane mirrors are inclined to each other at an angle $\theta$. A ray of light is reflected first at one mirror and then at the other. The total deviation of the ray is

  1. $2\ \theta$
  2. $240^{\circ}-\ 2 \theta$
  3. $360^{\circ}-\ 2\ \theta$
  4. $180^{\circ}-\ \theta$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a ray of light reflects off two mirrors inclined at an angle theta, the total deviation is 360 - 2*theta if the angle is measured in a specific way, but the standard formula for deviation after two reflections is 2*theta.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

The diameter of the sun subtends an angle of $ 0.5^0 $ at the surface of the earth. A converging lens of focal length 100 cm is used to provide an image of the sun on to a screen.the diameter ( in mm) of the image formed is nearly 

  1. 1

  2. 3

  3. 5

  4. 9
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

In case of image formation by plane mirrors:
(i) object can be real and image virtual
(ii) object can be virtual and image real
(iii) both object and image can be real
(iv) both object and image can be virtual

  1. (i) and (ii)

  2. (i), (ii) and (iv)

  3. (ii) and (iv)

  4. (i), (iii) and (iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A plane mirror forms a virtual image of a real object. If the rays are converging towards a point behind the mirror, the object is virtual and the image formed is real (in front of the mirror). Both real and virtual objects can result in real or virtual images depending on the convergence of incident rays.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

If a plane mirror is fixed and the incident ray is turned by an angle $30$ clockwise direction then 

  1. the reflected ray will turn by $60$ in anti clock wise direction
  2. the reflected ray will turn by $30$ in anti clock wise direction
  3. the change in deviation produced for the reflected ray will be $30$ in anti clock wise direction
  4. the change in deviation produced for the reflected ray will be $60$ in anti clock wise direction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a mirror is rotated by an angle theta, the reflected ray rotates by 2 * theta in the same direction. Here, rotating the incident ray by 30 degrees clockwise is equivalent to rotating the mirror by 30 degrees counter-clockwise relative to the incident ray, or simply applying the law of reflection which dictates the reflected ray shifts by twice the angle of rotation.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

If two plane mirrors be kept at an angle of $ 120^{0}  $ to each other, the number of images of a  object, kept between the two mirror is 

  1. $2$
  2. $3$
  3. $4$
  4. $5$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The number of images n formed by two mirrors at an angle theta is given by n = (360 / theta) - 1. For theta = 120 degrees, n = (360 / 120) - 1 = 3 - 1 = 2.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

Why is it difficult to read the image of the text of a page formed due to reflection by plane mirror?

  1. Due to lateral inversion

  2. It is virtual

  3. Due to reflection

  4. No difficulty
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a plane mirror, each point on the image is as far behind the mirror plane as the corresponding point on the object is in front.  So, the image of an object is reversed in the direction perpendicular to the surface of the mirror. Therefore, the concept is called as Lateral inversion. It is the apparent reversal of left and right that we often see in a plane mirror image. Due to this lateral inversion, it is difficult to read the image of a text page formed due to reflection by a plane mirror.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

An insect is sitting in front of a plane mirror at a distance $1$$\  m $ from it.

(a) Where is the image of the insect formed?
(b) What is the distance between the insect and its image?

  1. $(a)$ $2$ $m$ behind the mirror $(b)$ $1$$m$
  2. $(a)$ $2$$m$ infront of the mirror $(b)$ $1$$m$
  3. $(a)$ $1$$m$ infront of the mirror $(b)$ $2$$m$
  4. $(a)$ $1$$m$ behind the mirror $(b)$ $2$$m$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

For plane mirrors, the object distance (do) is equal to the image distance (di). That is, the image is the same distance behind the mirror as the object is in front of the mirror. If we stand a distance of 2 meters from a plane mirror, we must focus at a location 2 meters behind the mirror in order to view our image.
In this case, an insect is sitting in front of a plane mirror at a distance $1$$m$ from it.
Case (a):
As the object distance and image distance are equal, the image is formed at a distance of 1 m behind the mirror.
Case (b):
The image distance is 1 m and the object distance is 1 m. Hence, the total distance between the insect and its image is 2 m.