Question

While determining the focal length of a convex lens you try to focus the image of a distant object formed by the lens on the screen. The image formed on the screen as compared to the object, should be:
a) Erect and Highly diminished
b) Erect and Enlarged
c) Inverted and Highly diminished
d) Inverted and Enlarged

Answer 1

• Image formed by convex lens for the position of object an infinite distance:
• In the case of distant object to find the focal length of convex lens, the rays coming from the object are parallel and the object is considered to be at infinity.
• Object distance: Infinity
• Image position: At focus (F)
• Nature of image: Real, inverted, small in size

Ans: Option - (c)