Question

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Answer 1

HI THERE !
I HOPE YOU FIND THIS ANSWER VERY HELPFUL
90 degre will make the the angel

Answer 2

Hi there !

To find the number of images formed by a plane mirror inclined at a particular angle,
there is a simple formula for this
It states that

$n = (\frac{360}{theta}) - 1$
where n is the number of images and theta is the angle of inclination between the mirror.


Coming to the question

a) 120°

Using the formula

$n = (\frac{360}{theta}) - 1 \:$
we have

$n = ( \frac{360}{120} ) - 1$
n = 3 - 1 = 2

Thus,

2 images will be formed


b) 180°
Using the formula,

we have

$n = (\frac{360}{180} ) - 1$
n = 2 - 1 = 1

So,
only 1 image will be formed


c) 60°

$n = (\frac{360}{60} ) - 1$
n = 6 - 1 = 5

So,

5 images will be formed


d) 90°

$n = (\frac{360}{90}) - 1$
n = 4 - 1 = 3

So,

3 images will be formed.