Physics

Light and Mirrors

458 Questions

Light and mirrors questions cover the principles of reflection, image formation, and mirror magnification. Concepts include the properties of plane mirrors, the uses of concave mirrors in solar devices, and the behavior of light rays. These fundamentals are essential general science topics in major competitive examinations.

Plane mirror propertiesConcave mirror applicationsMirror magnification formulaLight reflection lawsImage formation

Light and Mirrors Questions

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 optics, what is an image ?

  1. The reproduction of an object formed on the screen

  2. The apparent reproduction of an object, formed by a lens or mirror system from reflected, refracted, or diffracted light waves

  3. The reproduction of an object which cannot be captured on the screen

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Optical image, the apparent reproduction of an object, formed by a lens or mirror system from reflected, refracted, or diffracted light waves.

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

Which of the following image can be obtained on screen ?

  1. Image formed by Plane mirror

  2. Image formed by Concave mirror

  3. Image formed by Convex mirror

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
$ \bf{Convex\ mirrors} $ and $ \bf{Plane\ Mirrors} $ always produce  virtual images 
$ \bf{Concave\ mirrors} $ produce both, real and virtual images. 

Only Real Images can be obtained on the screen. Thus, images formed by Concave mirror can be obtained on a screen.

Hence, the correct answer is OPTION B. 
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

Virtual Image can be formed using which of the following mirrors ?

  1. Concave Mirror

  2. Convex Mirror

  3. Plane Mirror

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
$ \bf{Convex\ mirrors} $ always produce a virtual, erect and diminished image and the decrease in size of image depends on the position of the object in front of the mirror.

$ \bf{Plane\ Mirrors} $ always produce a virtual and erect image having the same size as that of the object irrespective of the position of object.

$ \bf{Concave\ mirrors} $ produce real and virtual, erect and inverted, diminished, same-sized and magnified image depending upon the position of the object on the principal axis. The concave mirror forms a virtual and erect image only when the object is placed between the Focus and the pole of the mirror.

Thus, a virtual image can be formed by all the three mirrors.

Hence, the correct answer is OPTION D.
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

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 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.

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 a plane mirror, the image is as far behind the mirror as the object is in front of it. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The distance of image from the mirror is distance of image formed behind the plane mirror.

The given statement is $true$

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

State whether the following statement is True or False?
The size of the image produced by plane mirror is the same as that of the objects. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come.
Hence, the statement is true.

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

Choose the incorrect statement related to the image formed by a plane mirror:

  1. a plane mirror always forms a virtual image

  2. the image formed by a plane mirror may be magnified or diminished

  3. the image formed by a plane mirror is always unmagnified and laterally inverted

  4. the image formed by a plane mirror is always unmagnified and erect
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

As the image formed by a plane mirror is always virtual,upright, and of the same shape and size as the object it is reflecting.
Hence, option B is incorrect statement.

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

When the angle between two plane mirrors is $\displaystyle { 60 }^{ o }$, how many multiple images will be formed by the mirrors?

  1. $6$
  2. $7$
  3. $4$
  4. $5$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Number of images will be given by,

 
                  =$\dfrac{360}{\theta} -1$


given,  $\theta=60$

               $\therefore$    Number of images will be 5.

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

When a divergent beam of light is incident on a plane mirror, the image formed is

  1. Upright and real

  2. Upright and virtual

  3. Inverted and virtual

  4. Inverted and real
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It should be remembered that plane mirror always form virtual and errect image and that too of same but laterally inverted.