Question

Write three characteristics of the image formed by a
greater than twice the focal length of convex lens.
An object is placed at a distance between focal length and twice the focal length from a convex lens ​

Answer 1

Answer:

First two characteristics are usual for convex lenses - images would be real and inverted, given that object is placed not within focal point and center of lens.

If the object is placed at twice the focal length, from 1/u - 1/v = 1/f, we get

1/2f - 1/f = 1/v

or v = 2f, which means the image will be formed at twice the focal length. Note that both u and v are 2f and that means magnification is 1.

If the object distance is made to be higher, gradually the image will keep getting closer to focal point. Finally when the image is very far, it would be like parallel incident rays and the image will be at the focal point.

Step-by-step explanation:

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