Physics

Light and Mirrors

454 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 magic with mirrors lateral inversion right or left reflection at plane surface

Which of the following letters will be seen with some change in a plane mirror?

  1. M

  2. T

  3. L

  4. W
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Reflection through a plane mirror causes lateral inversion to the image.

The letters, M, T and W are laterally symmetric. So, no change will be observed after these letters are reflected on a plane mirror. The letter, L is not laterally symmetric. So, it will undergo lateral inversion and the image will appear different from the object.

Multiple choice evs magic with mirrors lateral inversion right or left reflection at plane surface

In the image formed by a plane mirror, the left of the object appears on the right and the right appears on the left. This is called lateral inversion.

  1. True

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

Lateral inversion is a phenomenon in which the left side of object becomes right side of image and right side of object appears as left side of image.


Given statement is $True$.

Multiple choice evs magic with mirrors lateral inversion right or left reflection at plane surface

While standing in front of a plane mirror, if you touch your ............ ear with the  right hand, it will be seen in the mirror that your right ear is touched with your ................ hand.

  1. Right, left

  2. Left, left

  3. Right, right

  4. Left, right
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

Right, Left or Left, Right both are correct,because thats the property of mirror.

Multiple choice conditions for a light ray to pass undeviated refraction of light at plane surfaces physics

A 5 cm thick glass slab is silvered at one of the surface to form a plane mirror. A point object is placed at a distance of $20cm $ from the unsilvered face. The image distance from the unsilvered face will be [R.I. of glass =1.5]

  1. 26.67cm
  2. $\frac {70}{3}$

  3. 20cm

  4. 25cm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The object is at 20 cm from the unsilvered face. The light travels through 5 cm of glass (mu=1.5) to reach the mirror. The apparent distance of the object from the mirror is 5/1.5 + 20 = 3.33 + 20 = 23.33 cm. The mirror forms an image at 23.33 cm behind the mirror. The light then travels back through the glass, where the image appears at an apparent distance of 23.33 * 1.5 = 35 cm from the mirror surface. The total distance from the unsilvered face is 35 + 5 = 40 cm? Wait, recalculate: The mirror is at depth 5 cm. Object is at 20 cm from surface. Distance to mirror = 20 + 5/1.5 = 20 + 3.33 = 23.33. Image is at 23.33 behind mirror. Total distance from surface = 23.33 + 5/1.5 = 23.33 + 3.33 = 26.66 cm.

Multiple choice conditions for a light ray to pass undeviated refraction of light at plane surfaces physics

Which of the following statements is false?

  1. A plane mirror produce a magnification of +1

  2. Focal length of a plane mirror is infinite

  3. For man of height h, to see his own complete image , a mirror of height at least equal to h is required
  4. For a ray of light, incidenting normally on a plane mirror, the angle of reflection is $ 180^0 $
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To see a full image in a plane mirror, the mirror height must be at least half the person's height (h/2), not equal to h. Thus, statement C is false.

Multiple choice physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

Type of reflection in which images are formed and reflection occurs from a smooth surface like that of mirror is known as: 

  1. diffused reflection

  2. regular reflection

  3. irregular reflection

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Regular reflection occurs from smooth surfaces and images are formed in this type of reflection.

Multiple choice physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

When all the parallel rays reflected from a plane surface are parallel, the reflection is known as:

  1. regular reflection

  2. irregular reflection

  3. diffused reflection

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When all the parallel rays reflected from a plane surface are parallel, the reflection is known as regular reflection .

Multiple choice physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

Why we are not able to see our image on a cardboard even though it reflects light?

  1. Because cardboard does not shine like mirror

  2. Because cardboard is not as durable as mirror

  3. Because cardboard's surface is irregular

  4. All
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

We can"t see our image on a cardboard because cardboard"s surface is rough and the reflection occurring on uneven surface is irregular reflection. So, the rays, after reflection, move to different directions. Images are not formed due to irregular reflections.

Multiple choice evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

A beam of light gets reflected from a plane mirror and a real image is formed. The incident beam should be 

  1. Parallel

  2. Convergent

  3. Divergent

  4. Plane mirror cannot form a real image
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  1. Plane mirrors don't usually form real images They form virtual images of real objects. However, things can be arranged so that a plane mirror does form a real image. A convergent light beam can do this. So the answer is "convergent"

  2. When at convergence point, a convergent beam of light is incident on the plane mirror, a real image is formed at the point

Multiple choice physics light : reflection and refraction from plane surface principle of reversibility of path of light image formation by plane mirror refractive index

Principle of reversibility can applied to 

  1. Lens system

  2. Mirror system

  3. Lens and mirror system

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Principle of reversibility can applied to both lens and mirror system,
Because the principle is followed by both-Path of ray of light is reversible or light traces back it's path while traveling in reverse direction or a ray of light can pass in either direction along the same path

Multiple choice components and importance of food science of kitchen evs

Which of the following mirror is the best for making solar cooker?

  1. Concave mirror

  2. Convex mirror

  3. Plane mirror

  4. Both (a) and (b)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A concave mirror is used in solar cookers because it converges parallel rays of sunlight to a single focal point, creating high temperatures necessary for cooking.

Multiple choice physics observing space: telescopes optical instruments : telescope the reflecting telescope optical telescope xx radio telescope and space telescopes

A reflecting telescope utilises :

  1. a convex mirror

  2. a concave mirror

  3. a prism

  4. a plano-concave lens
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror. That is why a reflecting telescope utilizes a concave mirror. If you observe the design of a reflecting telescope, it uses the incoming rays to focus through a concave mirror to focus on the second mirror which in turn sends the rays to the eye-piece. So, the concave mirror is intrinsic to the design of a reflecting telescope.

Multiple choice physics observing space: telescopes optical instruments : telescope the reflecting telescope optical telescope xx radio telescope and space telescopes

This question has Statement-1 and Statement-2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement 1 : Very large size telescopes are reflecting telescopes instead of refracting telescopes.
Statement 2 : It is easier to provide mechanical support to large size mirrors than large size lenses.

  1. Statement-1 is true and Statement-1 is false and statement-2 is true

  2. Statement-1 is false and Statement-2 is true

  3. Statements-1 and Statement-2 are true and Statement-2 is correct explanation for Statement-1

  4. Statements-1 and Statements-2 are true and Statement-2 is not the correct explanation for Statement-1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Large telescopes are reflecting telescopes because mirrors are easier to support from the back, whereas lenses must be supported at the edges, which causes sagging in large sizes.