The Above Lens Has a Focal Length of 10 cm. The object of Height 2 mm is Placed at a Distance of 5 cm from the Pole - Bzziii.com

The above lens has a focal length of 10 cm. The object of height 2 mm is placed at a distance of 5 cm from the pole. Find the height of the image. 

A. 4 cm 

B. 6.67 mm 

C. 4 mm 

D. 3.33 mm

C. 4 mm

Explanation:

Given,

= `"h"_{1}` = 2mm = 0.2cm

= u = -5cm

= `1/f` = `1/v` - `1/5`

= `1/v` = `1/10` - `1/5`

= `"1-2'/"10"` = `-1/10`

= v = -10cm

Now,

= m = `v/u` = `\frac{h_{2}}{h_{1}}`

= m = `"-10"/"-5"` = `\frac{h_{2}}{0.2}`

= `"h"_{2}` = 0.4 cm = 4mm