When an object is placed at infinity a __________ is formed at the focus in concave lens.

________ lenses are used is placed at infinity a ________ is formed at the focus .

Assertion: If object is placed at infinity, then a virtual image will be formed at first focus of a concave lens. Reason: First focal length of a concave lens is positive.

Assertion: If object is placed at infinity, then a virtual image will be formed at first focus of a concave lens. Reason: First focal length of a concave lens is positive.

When an object is placed at any finite distance from a concave lens, the image is formed…………….. .

Where in front of a concave mirror image of an extended object placed at infinity will be formed by the mirror? Mention one feature of the image.

Calculate the position of the image of an object when placed at (a) focus of a convex lens. (b) focus of a concave lens.

When an object is at infinity from a concave mirror, the image formed is