Question

A biconvex lens has a radius of curvature of magnitude `20cm`. Which one of the following options describes best the image formed of an object of height `2cm` place `30 cm` from the lens ?
A. Virtual , upright, height `=0.5cm`
B. Real, inverted, height `=4 cm`
C. Real, inverted, height `=1 cm`
D. Virtual, upright, height `=1cm`

Answer 1

Correct Answer - B
In general we have assume `mu=1.5`
So, `f=20cm`
`(1)/(f)=(1)/(v)+(1)/(u)implies(1)/(20)=(1)/(v)+(1)/(30)`
`(1)/(v)=(1)/(20)-(1)/(30)=(10)/(600)`
`v=60cm`
`(h_(i))/(h_(0))=2`
`h_(i)=2xx|h_(0)|impliesh_(i)=4cm`
Here, image is real, inverted, magnified field and the height of image is `4cm`.