If the object is placed at the focus of a convex lens, the image will be:
at infinity, real and highly enlarged
For a convex lens, the rays from an object placed exactly at the principal focus F become parallel to each other after refraction.
Parallel rays meet only at infinity, so the image is formed at infinity. Since the actual refracted rays meet (on the other side of the lens), the image is real and inverted, and it is highly enlarged.
An object at 2F gives a real, same-size image at 2F; an object beyond 2F gives a real, inverted, diminished image between F and 2F; and a convex lens forms a virtual image only when the object is between F and the optical centre, and that image is enlarged, not reduced.
Hence, the image will be at infinity, real and highly enlarged.
Similar Questions
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Important Questions from Optics
Who was the first one to use a glass prism to obtain the spectrum of sunlight?
Twinkling of stars is due to:
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
An object is placed 10 cm in front of a lens. The image formed is real, inverted and of same size as the object. What is the focal length and nature of the lens?
The power of a lens is -2.5 D. The type of lens and its focal length are respectively:
