When the object is placed far off, the image will be formed at the ............. (focus, centre of curvature)

When the object is at centre of curvature of a concave mirror, its image is formed at the centre of curvature. ____

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.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (a) between pole and focus of the mirror , (b) between focus and centre of curvature of the mirror (c) at centre of curvature of the mirror , (d) a little beyond centre of curvature of the mirror (e) at infinity

When an object is placed 15cm from a lens, a virtual image is formed. Mark the correct statements.

When a real object is placed 25cm from a lens, a real image if formed. Mark the correct statement(s) from the following:

An object AB is placed parallel and close to the optical axis between focus F and center of curvature C of a converging mirror of focale length f as shown in Figure. Then,

When we see an object the image formed on the retina is

STATEMENT - 1 : Image formed by a convex mirror is always virtual, erect and diminished. STATEMENT - 2 : In case of a convex mirror the image is erect and virutal, when the object is placed between focus and pole. STATEMENT - 3 : In case of a concave mirror the image is real, when the object is placed between focus and centre of curvature.

A point object is placed at a distance 20 cm from the focus of a concave mirror of radius of curvature 20 cm. Find the distance (in cm) of the image from the focus.

When an object is placed between two parallel mirrors, then number of images formed are