Question

An object placed at 2F of a convex lens will produce an image
(A). At 2F
(B). Real and inverted
(C). Enlarge
(D). Virtual

Answer 1

Hint: This can be determined by using a ray diagram which gives the information about position of the object and the image, nature of the image and size of the image using cartesian sign convention.

Complete step by step answer:
Lens is a piece of transparent material with two or at least one curved surface and its refractive index is different from the surroundings.
Convex lens is a lens is a lens with two curved surfaces and converges light which passes through it.
Let us consider a convex lens and ray- diagram of a convex lens.
When an object is placed at twice the focal length i.e.,2F image is also formed at 2F on the other side of the length.
The image formed is inverted as it looks upside down as that of an object and it can be caught on the screen, so it is a real image. The height of the image is the same as that of the object, so it is the same sized image.
Let us draw a ray diagram considering focal length f= 4cm and size 3cm. So, when an object is placed at 8cm that is 2f distance then image formation its position height shape and size is as shown below:

Thus, correct options are both A and B.

Note: Students may make mistakes by opting only option A or only option B, but as both the answers are correct, we have to opt both A and B. Option C is incorrect as the image formed is the same sized image not enlarged one .
Since the image is pointed downwards students may think that it is a virtual image, but inverted images are always real. So, option D is also wrong.