Physics, asked by arpitaanand99, 10 months ago

a convex lens has focal length of 20cm at what distance from the lens a 5 cm tall object be placed so that it forms me an image at 15 CM for the lens also calculate the size of the image formed

Answers

Answered by Anonymous

1/f = 1/v-1/u

1/(-20) - 1/-15= - 1/u

(15-20)/300 = - 1/u

1/u = - 5/300

u = - 60 cm

hi/ho= v/u

hi/5 = -15/-60

hi=5/4 cm=1.25 cm

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Answered by XxAnannyaxX

Answer:

f= - 20cm

v= - 15

1/v - 1/u= 1/f

m= v/u

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