a divergent lens has a focal length of 20 cm . At what distance should an object of height 4 cm from the optical centre of the lens be placed so that its image is formed 10 cm away from the lens. Find the size of image also ? board exam question only intelligent answer by sending pictures ..
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f=-20 ,
v=-10,
h=4cm
using lens formula,
1/v-1/u=1/f
we get u = -20 .
Using mirror formula,
hi/ho=v/u
=>hi/4=-10/-20
hi/4=1/2
=>hi=2 cm
Therefore height of image = 2cm
v=-10,
h=4cm
using lens formula,
1/v-1/u=1/f
we get u = -20 .
Using mirror formula,
hi/ho=v/u
=>hi/4=-10/-20
hi/4=1/2
=>hi=2 cm
Therefore height of image = 2cm
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