Question

please answer this question if you know the answer then only answer else reported answer correctly​

Answer 1

$\huge\rm { _!! Question !_! }$

How many images will be formed when two plane mirrors placed adjacent at 120 degrees to each other?

$\huge\rm { _!! Answer !_! }$

We are given that angle between two mirror is 120°.

Now, we have to find how many images will be formed. We know,

$\rm { No. \: of \: images = \dfrac{360°}{Angle \: b/w \: mirrors} -1 }$

$\rm { No. \: of \: images \: formed = \cancel { \dfrac{360°}{120°}} -1 }$

$\rm { No. \: of \: images \: formed = 3 -1 = 2 \: images. }$

${\underline {\underline {\boxed {\rm {\red { 2 \: images }}}}}}$

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$\huge\rm { _!! Golden \: key \: points !_! }$

Why happens when the image is formed using two mirror? ( Above question )

• That's because of multiple reflections.

When two plane mirrors are placed side by side so that the two mirrors make an angle to each other then many images are formed in the mirror.

This happens because of reflection between them.

⭐ Also, the number of images depend upon the angle between them and we can find the number of images by the formula -:

$\rm\red { No. \: of \: images = \dfrac{360°}{Angle \: b/w \: mirrors} -1 }$

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