a. Calculate the focal length of the mirror formed by the shiny bottom of a spoon that has a 2.51 cm radius of curvature.

f = 1.255 cm

Explanation:

The Radius of Curvature:

The radius of that hollow sphere, whose part is the spherical mirror, is known as ‘The Radius of Curvature’ of  mirror.

Focal Length:

The distance between principal focus and pole is called ‘Focal Length’. It is denoted by ‘F’

The focal length is basically equal to the half of the radius of curvature of the mirror:

where,

f = focal length = ?

r = radius of curvature = 2.51 cm

f = 1.255 cm

v 154.9= 0.9 length length s little over 154.9cm

this is poiselle's equation from fluid mechanic in physics. mech eng