Question

An image 3cm high is formed in pinhole camera if the magnification of image is 0.004 then the size of the object is a)0.012cm

b)0.0013cm
c)7.5cm
d)75cm​

Answer 1

To find the size of the object when an image 3cm high is formed with a magnification of 0.004, apply the magnification formula m = i / o, giving us o = 750cm or 75cm as the object's size.

Step-by-step explanation:

If an image 3cm high is formed in a pinhole camera and the magnification of the image is 0.004, we can calculate the size of the object using the magnification formula.

Magnification (m) is defined as the ratio of the height of the image (i) to the height of the object (o), mathematically expressed as m = i / o. Using the given magnification of 0.004, and the height of the image which is 3cm, we can rearrange the formula to solve for the object's height, o = i / m.

Substituting the known values, we get o = 3cm / 0.004, which gives us o = 750cm. Therefore, the size of the object is 750cm, which corresponds to answer choice d) 75cm.