The lens which is thick at the middle and thin at the edge is called

The lens which is thin at the middle and thick at the edges is called

Concave lens is also called

Convex lens is also called

The center of the sphere of which the lens is a part is called

The line joining both the centers of curvature of the lens is called

The geometrical center of the lens is called

The point in the principal axis where the parallel beam of light incident on convex lens meets after refraction is called

The point in the principal axis where the parallel beam of light incident on concave lens appears to meet after refraction is called

The distance between the optical center and focus of the lens is called

Image that can be obtained on the screen are called

Image that cannot be obtained on the screen are called

Real image are always

When the rays of light after refraction actually do not meet but the produced rays meet than the image formed is called

Convex lens forms image equal to size of object when the object is placed

The image formed by concave lens is virtual and erect only

when the object is placed

The image formed by ............................. lens is always virtual, erect and diminished

The process of adjusting distance between the lens and screen to produce clear image on the screen is called

Sharp and clear image is formed at the screen when image is formed at

The ratio of size of image to size of object is called

This is the picture of

The lens which is used in making peeping hole in a door is called

The converging or diverging ability of lens is called

The distance between near point and far point for an eye is called