A mirror has an upright image that is twice the size of the object. If the...

Question

Question

A mirror has an upright image that is twice the size of the object. If the object is 2? away, what is the focal length?

A. +1.3 ?

B. −0.25 ?

C. +4.0 ?

D. −0.75 ?

E. −3.0 ?

Answer 1

Answer #1

Object distance, u = 2 m
Consider the image distance as v and focal length as f.
Magnification = - v/u = 2
v = -2u
= - 4 m

Using the formula, 1/f = 1/u + 1/v,
1/f = 1/2+ 1/(-4)
= 1/4
f = 4 m

Answer 2

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