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What is the distance between the positions of the original and final images seen in the mirror if an object is placed 20 cm in front of a plane mirror and the mirror is moved 2 cm towards the object?

What is the distance between the positions of the original and final images seen in the mirror if an object is placed 20 cm in front of a plane mirror and the mirror is moved 2 cm towards the object?

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A. 2 cm
B. 4 cm
C. 10 cm
D. 22 cm

This question is part of Light - Reflection and Refraction
Asked by Jagran josh, Last updated: Jan 21, 2020

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3 Answers

l.Steven

L.Steven

Answered Jan 07, 2018

As the object was initially placed 20 cm in front of the plane mirror, the image formed was 40 cm away from the original object. Now, when the mirror is moved 2 centimeters towards the object, the image also moves two towards the object. In this perspective, the distance of the image from the mirror will be 18+18, which is 36.

Now forty minus thirty-six is 4 centimeters, which simply defines the distance between the original and the final mirror images. You need to keep the image distance in mind and also include the distance that image moved in order to calculate the correct answer.

 

John Adney

John Adney

Answered Jan 05, 2017

Not sure why this is the ans
 

John Smith

John Smith

Answered Nov 16, 2016

4 cm
 

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