Question

An object of length `1`cm is placed at a distance of`15cm`from a concave mirror of focal length`10cm`.The nature and size of the image are-
(1) real,inverted,`1.0cm` ,(2)real, inverted,`2.0cm`
,(3)virtual ,erect,`0.5cm` (4) virtual ,erect,`1.0cm`

Answer 1

Given`u=-15cm,f=-10cm,O=1cm`
`(1)/(v)+(1)/(u)=(1)/(f) ,=(1)/(v)=(1)/(f)-(1)/(u)=(1)/(-10)-(1)/(-15)`
`:.v=-30cm (1)/(O)=-(v)/(u)=-(-30)/(-15)=-2`
`l=-2xx1=-2` Image is inverted and on the same side(real)of size`2cm`.