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 structure of human eye human eye and colourful world

A girl whose eyes are $150  \mathrm{cm}  $ above the ground looks at her reflection in a vertical mirror $ 250  \mathrm{cm}  $ away. The top and bottom of the mirror are $200 \mathrm{cm}  $ and  $120 \mathrm{cm} $ above the ground respectively. What length below her eyes can she see of herself in the mirror?

  1. $60 cm$
  2. $75 cm$
  3. $100 cm$
  4. $120 cm$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The girl's eyes are at 150 cm. The mirror spans 120 cm to 200 cm. The portion of the mirror she can see is determined by the geometry of reflection. She can see the part of the mirror from 120 cm to 200 cm, which is 80 cm, but the question asks for the length of herself she can see, which is twice the mirror height available relative to her eye level.

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 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

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 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 the above are correct

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A plane mirror forms an image that is virtual, erect, the same size as the object, and laterally inverted.

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 sideways reversal of the image by plane mirror is called

  1. lateral inversion

  2. parallex

  3. optical illusion

  4. none of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lateral inversion is the side ways reversal of the image's left and right when compared that of object.Lateral inversion is observed in images formed by 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

In case of plane mirror, the size of the image is equal to the size of the object, irrespective of the distance of the object from the mirror.

  1. True

  2. False

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Magnification of a plane mirror is unity irrespective of distance of object 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

The image of a real object in a plane mirror is always:

  1. Virtual

  2. Erect

  3. Laterally inverted with respect to the object

  4. All of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It should be remembered that `plane mirror always form virtual, errect and laterally inverted image.

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 true or false.
The image formed by a plane mirror is of the same size as the object.

  1. True

  2. False

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.