Question

A man is shaving with his chin 0.4m from a concave magnifying mirror. If the linear
magnification is 2.5, what is the radius of curvature of the mirror?
(a) 1.73 m
(b)-1.52 m
(c) 1.45 m
(d) None of those​

Answer 1

Answer:

d

Explanation:

I = image height

O = object height

Magnificatin = I/o = 2.5

v = 2.5 O

1/i + 1/o = 1/f

-(1/2.5o) + 1/o = 1/f

(1/o )(-2/5 + 1) = 1/f

(1/o)*(3/5) = 1/f

f = O×(5/3)

= 0.4 × 5/3

= 2/3

R = 2*2/3 = 4/3 = 1.33