# A concave lens has a focal …

A concave lens has a focal length of 10 cm. An object 2.5 cm high is placed 30 cm from the lens. Determine the position and size of the image ??

Gulshan Kumar 1 week, 2 days ago

H1/H2
Thank you for answering my question.

Anuj Mittal 1 month, 1 week ago

F= - 10 CM

H1 =2.5 CM

U = -30CM

{tex}{ 1\over F } = {1\over v } -{ 1\over u}{/tex}

1/-10=1/v -1/-30

1/-10 +1/30  = 1/v

(-3+1)/30=1/v

-2/30 = 1/v

-1/15 =1/v

v = -15

position is on left side 15 cm away from the lens

{tex}{H2 \over H1 } = {v \over u}{/tex}

H=  (-15*2.5)/-30

H= 1.25 cm

as it is positive so image is virtual and erect

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