Question

An object of size. 7cm is placed at 27 cm in front of a concave mirror of focal length 18 cm . at what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained? find the size and the nature of the image. please help me with a correct answer.

Answer 1

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Answer 2

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

(1/v)+(-1/27)=(-1/18)

1/v=(-1/18)-(-1/27)

1/v=(1/27)-(1/18)

1/v=-1/54

v=-54

screen should be placed 54cm away from the mirror on object size

image is real n inverted

m=(-v/u)

m=h'/h

so (-v/u)=(h'/h)

-(-54/-27)=h'/7

-54/27=h'/7

-2=h'/7

h'=7 (-2)

h'=-14

so the image will be inverted and of height 14cm