Class 10 (2078)

A piece of transparent glass bounded by two refracting surfaces which are usually spherical in shape are called

• Mirror

• Lens

• Glass

• Spoon

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

• Convex lens

• Concave lens

• Planoconvex lens

• Concavo-convex lens

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

• Convex lens

• Concave lens

• Planoconvex lens

• Concavo-convex lens

Concave lens is also called

• Converging lens

• Diverging lens

Convex lens is also called

• Converging lens

• Diverging lens

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

• Optical center

• Radius of curvature

• Center of Curvature

• Radius of curvature

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

• imaginary line

• Axis

• Principal focus

• Principal axis

The geometrical center of the lens is called

• Center

• Centroid

• Optical Center

• Center of Curvature

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

• Center

• Optical center

• Focus

• Focal length

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

• Focus

• Focal length

• Optical Center

• Center of curvature