Which lens is diverging?
Convex lens
Both (a) and (b)
None of these
Concave lens
Which lens is converging?
convex lens
A ray of light incident on a lens parallel to its principal axis, after refraction passes through.
The centre of curvature of its second surface
Its first focus
Its optical centre
its second focus
A ray of light after refraction through a lens emerges parallel to the principal axis of the lens. The incident ray either passes through or apper to meet
Second focus
Centre of curvature of first surface
Optical centre
First focus
A ray of light incident at a point on the principal axis of a convex lens, passes un deviated through the lens. What special name is given to this point on the principal axis?
First focal point
Second focal point
A convexo - concave lens is
Thick at the centre and thin at the periphery
Thin at the centre and thick at the periphery
Thick at the centre with one surface plane
The centre of the sphere whose part is the lens surface, is called the ____________ of that surface of the lens.
Centre of curvature
Radius of curvature
Principal foci
A con cavo-convex lens is
Thin at the centre with one surface plane
A beam of light incident on a convex lens parallel to its principal axis converges at a point on the principal axis. Name the point.
A ray of light directed towards the optical centre of a lens, after refraction:
is reflected black
Passes through the focus
Be comes paralll to the principal axis after refraction
Passes undeviated
