Tag: formation of image in a plane mirror

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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

A plane mirror:
(i) can form real image of a real object
(ii) neither converges not diverges the rays
(iii) cannot form real image of a real object
Choose the correct option or options.

  1. (i) is correct

  2. (i) and (ii) are correct

  3. (ii) and (iii) are correct

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Plane mirrors always produce virtual images, because they never focus light into a single converging point.
  • Hence it does not produce real object or image
  • As power of the plane mirror is zero, hence, it neither converges nor diverges the rays.
  • Hence the option C is the right 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

An object is kept at $60$cm in front of a plane mirror. If the mirror is now moved $25$cm away from the object, how is the image shifted from its previous position?

  1. $25$ cm away
  2. $25$ cm towards
  3. $50$ cm away
  4. $50$ cm towards
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In this case, the mirror is moved 25 cm away from its initial position. Therefore, if the mirror is moved with distance x, then image in the mirror will move by distance 2x.
That is, 2x=50 cm.
So, the image will shift by 50 cm away from its previous position.

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

Image formed by a plane mirror is 

  1. virtual, behind the mirror and enlarged

  2. virtual, behind the mirror and of the same size as the object

  3. real at the surface of the mirror and enlarged

  4. real, behind the mirror and of the same size as the object.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.

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.
To summarize, the image formed by plane mirrors are,
1. Virtual 
2. Behind the mirror 
3. Erect (means not inverted) 
4. Same size as the object 
5. At same distance from the mirror as the object is from the 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

What type of image is formed by a plane mirror ?

  1. Upright

  2. Magnified

  3. inverted

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

Images formed by plane mirrors are virtual, upright, left-right reversed, the same distance from the mirror as the object's distance, and the same size as the object.

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 virtual image is always erect. 

  1. True

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

An image, such as that seen in a mirror, in which the rays of light appear to be emanating from some object that is not there is called a virtual image. Virtual images are always erect. They, also, may be either larger or smaller than the object.
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

During normal incidence of light:

  1. angle of incidence is $90^0$
  2. angle of incidence is $0^0$
  3. sum of angle of incidence and angle of reflection is $90^0$

  4. angle of incidence is greater than angle of reflection
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Angle of incidence and the angle of reflection measured from the normal drawn on the point of incidence.

During normal incidence the light is incident along the normal on the point of incidence.
So, angle of incidence is $0^0$.

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 object is placed 15 cm from a diverging mirror, of radius of curvature 20 em. What is the image magnification produced?

  1. +0.4

  2. -0.4

  3. +2

  4. -2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Answer is D.

For a spherically curved mirror in air, the magnitude of the focal length is equal to the radius of curvature of the mirror divided by two. The focal length is positive for a concave mirror.
Therefore, the focal length of the mirror is 20 cm / 2 = 10 cm.
The mirror equation expresses the quantitative relationship between the object distance (do), the image distance (di), and the focal length (f). The equation is stated as follows:
1/f = 1/do + 1/di
So, 1/di = 1/f - 1/do = 1/10 - 1/15
Therefore, di = 30 cm.
The magnification equation relates the ratio of the image distance and object distance to the ratio of the image height (hi) and object height (ho). The magnification equation is stated as follows:
M = hi / ho = -(di / do) = -(30 / 15) = -2.
Hence, the image magnification produced is -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

A person looks into the mirror by placing it close to his face. The image of his face was erect, laterally inverted and of the same size. Then, the mirror must be :

  1. plane

  2. concave

  3. convex

  4. plane or concave
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The nature of the image formed by a plane mirror is virtual, erect, of the same size and also laterally inverted