1.

An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and nature of the image formed.

Answer»

Solution :`h_(1)=5cm`
`u--25CM`
`f=10cm`
`V=?`
`h_(2)implies?`

`1/f=1/v-1/u`
`1/v=1/f+1/u`
`=1/10+1/(-25)`
`v=250/15`
`v=50/3`
`v=16.67cm`
`(h_(2))/(h_(1))=v/u`
`h_(2)=v/uxxh_(1)`
Or `(h_(1))/6=16.7/(-2.5)`
`h_(2)=3.34cm`

Image is REAL and inverted.


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