Question

an object is placed at 30 cm in front of concave lens of focal length 10 cm. at what distance from the lens image is formed​

Answer 1

Given:-

object distance :- -30cm

focal length :- -10cm

1/f=1/u + 1/v

=> 1/v= 1/f - 1/u

=> 1/v = 1/(-10) + 1/(-30)

=>1/v = -{ 1/10+1/30}

=>1/v = - { (3+1)/30}

=>1/v = - {4/30}

=>1/v= - {2/15}

or,

v=-15/2cm

hence, image distance = 15/2cm

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