Asked/Added Questions From NCERT:

Question 1. Asked on :16 October 2019:07:59:32 PM

Why magnification is taken negative for real images and positive for virtual images?

-Added by Himanshi Verma Science » Light Reflection And Refraction

Answer:

Himanshi Verma

If image is real, it will be inverted which means height of image will be taken as negative. Also, the height of object is always positive.

Now as magnification = Height of image / Height of object.

Therefore, in case of real image,
Magnification = Height of image (-) / height of object (+)=Negative.
So, Magnification will be negative.
Similarly, if image is virtual, it will be erect.

Therefore, in case of virtual image,
Magnification = Height of image (+) / height of object (+)= Positive
So, Magnification will be positive.

-Answered by Himanshi Verma On 16 October 2019:08:00:38 PM(14923Average Rating Based on rating)

Answer:

priyanshu kumar

If image is real, it will be inverted which means height of image will be taken as negative. Also, the height of object is always positive.

Now as magnification = Height of image / Height of object.

Therefore, in case of real image,
Magnification = Height of image (-) / height of object (+)=Negative.
So, Magnification will be negative.
Similarly, if image is virtual, it will be erect.

Therefore, in case of virtual image,
Magnification = Height of image (+) / height of object (+)= Positive
So, Magnification will be positive.

-Answered by priyanshu kumar On 17 October 2019:08:35:34 AM(14934Average Rating Based on rating)

Answer:

Nishant Verma

If image is real, it will be inverted which means height of image will be taken as negative. Also, the height of object is always positive.

Now as magnification = Height of image / Height

Therefore, in case of real image,

Magnification = Height of image (-) / height of object (+)=Negative.
So, Magnification will be negative.
Similarly, if image is virtual, it will be erect.

Therefore, in case of virtual image,
Magnification = Height of image (+) / height of object (+)= Positive

So, Magnification will be positive. of object.

-Answered by Nishant Verma On 17 October 2019:02:32:30 PM(15010Average Rating Based on rating)

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