Question

.द फोकल लेंथ ऑफ कॉन्वेक्स लेंस इज 10 सेंटीमीटर एंड फाइंड द फॉर्म ऑफ ​

Answer 1

Answer:

Here, the real image is formed on the wall which is at a distance of 12 cm from the convex lens. This means that the distance of image from the convex lens or image distance will be 12 cm. Since a real image is fomred on the right side of the lens, so this image distance will be positive.

Now, Image distance, v=±12 cm (A real image)

Object distance, u=? (To be calculated)

Focal length, f=+10 cm (it is convex lens)

Putting these values in the lens formula:

1v−1u=1f

We get: 112−1u=110

112−110=1u

5−660=1u

−160=1u

So, Object distance, u=-60 cm

Thus, the obect should be place at a distance of 60 cm in front of the convex lens. The minus sign shows that the obect is on the left side of the lens.