Question

An object of height 4 centimetre is placed at a distance of 15cm cm in front of concave lens of power -10 diopter find the size of the image.​

Answer 1

Answer:

Concave lens

ho = 2 cm

u = -40 cm

P = 1/f

5=1/f

f= 1/5 x 100cm

f=20 cm

Using lens formula

1/v - 1/u = 1/f

1/v = 1/20 + 1/-40

1/v = 2-1/40

1/v = 1/40

v=40cm

hi/ho = v/u

hi=v/u x ho

hi = 40/-40 x 2

hi = 2 cm

Image height is 2cm

Answer 2

Answer:

your answer is here buddy....

given,

ho=-4cm

v=-15

p=-10D

to find hi

P = 1/f

5=1/f

f= 1/5 x 100cm

f=20 cm

Using lens formula

1/v - 1/u = 1/f

1/v = 1/20 + 1/-40

1/v = 2-1/40

1/v = 1/40

v=40cm

hi/ho = v/u

hi=v/u x ho

hi = 40/-40 x 2

hi = 2 cm

Image height is 2cm

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