An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is : (a) 2 cm (b) 4 cm (c) 10 cm (d) 22 cm

By Ritesh|Updated : November 13th, 2022

The distance between the positions of the original and final images seen in the mirror is 4 cm. We know that the distance between an object and a plane mirror is equal to the distance between the object and its reflection. The created image was 40 cm away from the original object, which was initially positioned 20 cm in front of the plane mirror.

The picture now moves in step with the mirror when it is tilted 2 centimeters in the direction of the target. The object's distance from the mirror is now 18 cm. The image's distance from the mirror is also 18 cm. The image will be 18+18 cm = 36 cm away from the item in this perspective. The difference between the original and final photos is therefore equal to 40 cm - 36 cm = 4 cm.

How does a Mirror Work?

  • We are aware that light is reflected when it strikes a reflecting surface.
  • We also know that energy can be reflected or absorbed because the light is energy. Mirrors in this place reflect light.
  • Because mirrors are smooth at the microscopic level, they are the only flat white surfaces that reflect light.
  • Diffuse reflection occurs when light energy strikes a rough surface and bounces back in all directions.
  • But over a smooth surface, light only reflects in one direction, a phenomenon known as specular reflection.

Summary:

An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is : (a) 2 cm (b) 4 cm (c) 10 cm (d) 22 cm

An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is 4 cm.

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