write the characteristics of the images formed by convex lens having focal length of 25cm, when an object is kept on the principle axis at a distance of 50cm and 75cm.
Answers
Answer:
The focal length of the convex lens is 25cm.
When the object is kept at a distance of 50cm from the lens, the distance is equal to twice the focal length. Hence, the image would be real and inverted and would be formed at the same distance from the lens as the object but on the other side of the lens.
When the object is kept at a distance of 75cm from the lens, the distance is greater than the focal length. Hence, the image would be real and inverted and would be formed on the .other side of the lens.
The distance of the image can be calculated from the lens formula 1v−1u=1f.
⇒v=ufu+f=−75×25−75+25=37.5cm.
Hence, the image would be real and inverted and would be formed at the same distance from the lens as the object but on the other side of the lens.
Explanation: