Question

. Students were told to perform an activity with the help of two plane mirrors. They set
them at 45% 60% and 90% angles with their edges touching. Numbers of images they
will get at these angles are-
(a) 7,5,3 (b) 5,3,7
(c) 5,7,3 (d) 3,7,5

Answer 1

Answer:

(a) 7, 5, 3

Step-by-step explanation:

The formula for finding the number of images formed by two plane mirrors is

= (360/a) - 1 (where a is angle between the mirrors)

Implementing that formula in the options, option a will be the correct answer. Mark as brainliest pls :)

Answer 2

Given,

Angles between 2 plane mirrors

a1= 45°

a2=60°

a3= 90°

To find,

Numbers of images they will get at these angles (n)

Solution,

Using the formula,

Number of images when two plane mirrors are placed at an angle a°,

⇒n=$\frac{360}{a} -1$

For a1, n= $\frac{360}{45} -1$

⇒n= 8-1

⇒n=7

For a2, n= $\frac{360}{60} -1$

⇒n= 6-1

⇒n=5

For a3, n= $\frac{360}{90} -1$

⇒n= 4-1

⇒n=3

Hence, the number of images would be 7,5,3. Hence, option a is the correct answer.