An object 60cm tall is placed …

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An object 60cm tall is placed at on the principle axis of a convex and its 30cm tall image is formed on the screen placed at a distance of 40cm from the object . What is the focal length of the lens

Posted by Rohan Patel 5 years, 11 months ago

CBSE > Class 10 > Science

21 answers

Rohan Patel 5 years, 11 months ago

Answer =26.67cm

0Thank You

Aadya Singh ? 5 years, 11 months ago

Bhai...iska answer pta h kya..??? Bta do please...ek bar pakka sahi solve karungi ????

1Thank You

Aadya Singh ? 5 years, 11 months ago

Pehle wala solution kar lo..vo sahi h...bas maine galti se distance of Object = 40 likh diya h...vha pe distance of image kar lo....and bye..ab so jao ????

1Thank You

Aadya Singh ? 5 years, 11 months ago

Pehle wala solution correct h...image distance 40cm hi diya hua h...

1Thank You

Aadya Singh ? 5 years, 11 months ago

Phir se galat hua ?‍♀?‍♀????

1Thank You

Rohan Patel 5 years, 11 months ago

But magnification=h of image/ h of object

1Thank You

Aadya Singh ? 5 years, 11 months ago

Ab sahi h..??? ???

1Thank You

Rohan Patel 5 years, 11 months ago

???

1Thank You

Aadya Singh ? 5 years, 11 months ago

Kar diya bhai...but meko bhai mat bolo...behen bolo ????

1Thank You

Aadya Singh ? 5 years, 11 months ago

By lens formula,
1/f = 1/80 + 1/40
1/f = 3/80
f = 80/3
f = 26.67 cm...

1Thank You

Aadya Singh ? 5 years, 11 months ago

Height of object = 60cm , height of image = -30cm .
v+u = 40cm.....(1) .
Now, by magnification formula,
-v/u = 60/-30
v = -2u .....(2) .
Now, put the value of equation (2) in (1),
-2u+u = 40
=> u = -40cm .
And, v = -2u => -2 × (-40) => 80cm...

1Thank You

Rohan Patel 5 years, 11 months ago

Karde bhai solve

1Thank You

Aadya Singh ? 5 years, 11 months ago

Sorry...ye wrong h...but answer sahi h ???bolo to phir se solve karu...

1Thank You

Aadya Singh ? 5 years, 11 months ago

V means image distance hota h...and vha pe diya h..image is formes at a distance of 40cm.....to v = 40cm hi hoga na..?? ??

1Thank You

Rohan Patel 5 years, 11 months ago

Bhai v=40 kaise ho sakta hai Distance between object and image 40 hai??

1Thank You

Aadya Singh ? 5 years, 11 months ago

Bhai...bol to do..sahi h ki nahi ????

1Thank You

Aadya Singh ? 5 years, 11 months ago

Hope..u got it ☺

1Thank You

Aadya Singh ? 5 years, 11 months ago

Using lens formula,
1/f = 1/v - 1/u
1/f = 1/40 + 1/80
1/f = 3/80
f = 80/3
f = 26.67 cm..

1Thank You

Aadya Singh ? 5 years, 11 months ago

Height of Object = 60cm , height of image = 30cm , distance of object , v = 40cm .
Now, by magnification formula,
m = -v/u = height of image / height of Object.
-v/u = 30/60 => u = -80cm..

1Thank You

Rohan Patel 5 years, 11 months ago

Please solve it

1Thank You

Aadya Singh ? 5 years, 11 months ago

The focal length of the Object is 26.67 cm..

1Thank You

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