Question

An object of height 5cm is placed at a distance of 15 cm in front of a concave lens power-10 d. find the size of the image​

Answer 1

Answer:

Concave lens

ho=+4 cm

u=-15 cm

P=1/f       f=Focal Length 

 -10 =1/f

f=(1/-10)×100  cm

f=-10cm

using lens formula

1/f=1/v-1/u

⇒1/v=1/f+1/u

⇒1/v= -1/10 -1/15

⇒1/v=(-3-2)/30

⇒1/v=-5/30

⇒1/v=-1/6

Image distance (v)= -6 cm

hi/ho=v/u

⇒hi=v/u×ho

⇒hi=-6/-15 ×5

⇒hi=2/5 ×5

⇒hi=10/5cm

⇒hi=2 cm

Image Height =2 cm Answer.