An object is placed at 100 cm from the plane mirror and now mirror is moved 25 cm towards object. How does the image shifts from initial position?
Answers
Characteristics of a Plane Mirror
A plane mirror is a flat polished surface that is reflective. To answer this question, we must understand its characteristics:
→ Image formed is virtual and erect. This means it is not upside down, and it cannot be obtained on a screen.
→ Image formed is the same size as the object. Say, if the object is of 10 cm, then the image is of 10 cm too.
→ Image formed is at the same distance from the mirror as the object is from the mirror. This characteristic is going to help us solve this question.
Let's do it!
Answer
Given,
- the object is placed at 100 cm from the mirror
- the mirror is moved 25 cm towards the object.
Now, the distance between the object and the mirror = 100 - 25 = 75 cm
Therefore, the object is 25 cm closer to the mirror now.
As we know from the characteristics of a plane mirror, the image will also move 25 cm towards the mirror.
The image's position will now be 75 cm away from the mirror.
Thus the image's position shifts from its initial position by 25 cm.