Question

To get three images of a single object, one should have two plane mirrors at an angle of(a) 30°(b) 60°(c) 90°(d) 150°

Answer 1

to get 3 image the angle between two mirror should be 90°

Answer 2

To get "three images of single object", one should have "two plane mirrors" at an angle of $90^\circ$.

Option-C

Explanation:

In the given case we are given the number of images we need and the number of mirrors we have placement of the Mirrors will decide the number of images.

We get hence the angle needs to be found out for which the formula that will be used is  

Number of images = $\frac{360}{x}-1$

Now we know the number of images we want so applying the data and finding the value of x,  

3 = $\frac{360}{x}-1$

⇒  4 $=\frac{360}{x}$

⇒ x= $90^\circ$

So we get that the two mirror shall be placed at 90 degree angle to get 3 images.

To know more:

To get five images of a single object one should have two plane mirrors at an angle of ____________.

(a) 36° (b) 72° (c) 180° (d) 360°

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