Physics, asked by Vinaynayak27, 1 year ago

a convex lens of focal lenght 15 cm forms an image 10cm from the lens.Find the object distance

Answers

Answered by bappu83

hope you get it.........

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Vinaynayak27: no bro

bappu83: whats the answer?

bappu83: 1/v - 1/u = 1/f ....this is lens formula ...right?

Vinaynayak27: yes bro

bappu83: ans has to be 30 or -30

Vinaynayak27: bro it supposed to be -6 cm but i am seeking the answer to match mine with them

bappu83: idk...but...Given,

focal length, f = -15 cm

Distance of image, v = -10 cm

Distance of object, u =?

We know that,

1/v - 1/u = 1/f

So,

1/-10 - 1/u = 1/-15

So, -1/10 + 1/15 = 1/u

(-3 + 2)/30 = 1/u

-1/30 = 1/u

Therefore u = -30 cm

bappu83: https://www.zigya.com/study/book?class=10&board=cbse&subject=science&book=science&chapter=light+-+reflection+and+refraction&q_type=&q_topic=&q_category=&question_id=SCEN10053025

bappu83: check this out...

bappu83: think -6cm = 30 cm....acc to fig..

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