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

Which of these are characteristics of an image formed by a plane mirror?

  1. The image is virtual

  2. The image is erect

  3. The image formed is of the same size as that of
    the object

  4. The image is laterally inverted
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

Image formed by a plane mirror is always virtual, errect, laterally inverted (sideways inverted) with unit magnification.

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. of same size as that of object

  2. at the same distance behind the mirror as the object in front

  3. erect

  4. real in nature
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

The image formed by a plane mirror is erect and virtual in nature and of same size as that of the object. The distance of image from the mirror, behind the mirror, is same as the distance of the object from the mirror, in front of 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

No matter how far you stand from a mirror, your image always appears erect. The mirror is likely to be:

  1. Plane

  2. Concave

  3. Both A and B

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$ \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.  
But the concave mirror forms a virtual, erect and enlarged image only when the object is placed between the Focus and the pole of the mirror.


Hence, the correct answer is OPTION A.

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. Erect, virtual, same size as the object

  2. Inverted, real, smaller size as the object

  3. Erect, real, same size as the object

  4. Inverted, virtual, smaller size as the object
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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


Hence, the correct answer is OPTION A.

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 is formed at that point where

  1. At least two rays of light meet

  2. Where three rays of light meet

  3. Where two rays of light appear to meet

  4. B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Real image is formed at a point where light rays actually meet where virtual image is formed at a point where rays of light appears to meet.

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 of an object is seen in a plane mirror, the distance from the mirror to the image depends on

  1. The wavelength of light

  2. The distance of the object from the mirror

  3. The distance of both the observer and the object to the mirror

  4. The thickness of the mirror
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Images in a plane mirror are formed as far behind the mirror as the object in front of it. 
Thus, the distance of the image of an object from the mirror is equal to the distance of the object from the mirror. 

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
If the object is shifted by a distance towards the mirror, the image will shift by _______ towards the mirror. Fill in the blank.

  1. double the distance

  2. same distance

  3. half the distance

  4. all
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is obvious that if the object is shifted by a distance $d$ towards the mirror, the image will also shift the same distance $d$ towards the mirror i.e., the separation between the object and the image will decrease by $2d$.

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

Distance between an object and plane mirror is 100cm. Find the distance between the object and its image.

  1. $50 cm$
  2. $100 cm$
  3. $200 cm$
  4. $300 cm$
  5. $400 cm$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For plane mirror, the distance between object and mirror $=$ distance between image and mirror $=100$ (given)

Thus, distance between the object and image $=100+100=200 cm$ 

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 will be the condition of image when you stand in front of a plane flat mirror and look at yourself and you raise your right hand?

  1. Erect and enlarged

  2. Erect and reduced

  3. Erect and reversed

  4. Inverted and reversed

  5. Inverted and reduced
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The image formed will be an erect image of same height as that of the person (object) but laterally reversed  i.e his right hand will appear to be his left hand of his mirror image and vice-verse.

Thus option C is correct.

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 candle is placed in front of an optical instrument, and an image is obtained as erect, virtual, and reversed from left to right. Identify the device that would produce the types of images described above.

  1. Concave mirror

  2. Convex mirror

  3. Concave lens

  4. Convex lens

  5. Flat mirror
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The image formed by concave mirror can be real or virtual and inverted as well.
The image formed by the convex mirror will be virtual, erect but smaller in  size than the object.
The image formed by convex lens can be inverted.
Plane mirrors are the only mirrors for which the image will always be virtual, erect and of the same size as the object. The image produced is 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

When the distance between the object and the plane mirror increases.

  1. The image remains same

  2. The size of the image will become less than the size of the object

  3. The distance between the image and the plane mirror increases

  4. The distance between the image and the plane mirror decreases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since image formed by a plane mirror is at a same distance as that of object distance increases then image distance will also increase.

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 forms a virtual and erect image of same size for all positions of the object?

  1. Convex lens

  2. Plane mirror

  3. Convex mirror

  4. Concave mirror
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plane mirror and convex mirror will always form virtual and erect images for all position. Convex mirror forms diminished 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

Which of the following is a valid point in differentiating between an Image and an Object ?

  1. Image is the point of intersection of reflected/refracted rays while Object is the point of intersection of incident rays

  2. Object is the point of intersection of reflected/refracted rays while Image is the point of intersection of incident rays

  3. Image is the point of intersection of reflected rays while Object is the point of intersection of refracted rays

  4. Image is the point of intersection of refracted rays while Object is the point of intersection of reflected rays
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Object is defined as point of intersection of incident rays. Image is defined as point of intersection of reflected rays (in case of reflection) or refracted rays( in case of refraction).