Question

An object is placed 40.0 cm in front of a convex mirror.
The image appears 15 cm behind the mirror. What is
the focal length of the mirror?
(a) +24 cm (b) +11 cm
(c) -11 cm (d) -24 cm​

Answer 1

Answer:

Option (a) +24cm

Step-by-step explanation:

The whole sum is done in the image.

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Answer 2

Answer:

option A is correct

Step-by-step explanation:

the mirror equation is 1/v+ 1/u = 1/f

sign of convention

u= -40 and v= 15

1/f = (u + v)/(uv); f = (uv)/(u+v)

f= (-40×15)/(-40+15)

= -600/-25

f = 24cm