Question

An object is placed at a distance of 15 cm from a concave lens of focal length 30cm list four characteristics of the image formed by the lens ?

Answer 1

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An object is placed at a distance of 30cm from a concave lens of focal length 15cm. List four characteristic (nature, position,etc)of the image formed by the lens

Report by Vaishnavi20503 10.10.2017

Answers

Sreepallavi Ambitious

u=-30cm f= -15cm

1/f=1/v-1/u

1/v=1/f+1/u

on substituting v=-10cm

m=v/u

m=-10/-30

m=1/3=.33

so the magnification is positive so it is a virtual erect image .

m isless than 1 so the image is diminished .

and v is negative so the image is formed on the same side of the lens

Answer 2

U=-15
F=-30
V=?
1/v+1/u=1/f
1/v=1/f-1/u
1/v=1/-30-1/-15
1/v=1/-30+1/15
1/v=-1+2/30
1/v=1/30
V=30