Question

There is a logical question☺️​

What will be the circumference of of a spherical mirror whose focal length is 2 metre

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Answer 1

Answer:

as we know that

focal length is 2

then f=r/2

2*2=r

r=4m

then circumference is =2^r

circumference =2×22/7×4

=8×3.14

= 25.12

hope it helps you