Which is diverging lens?
All of these
Concavo convex lens
equi-convex lens
Equi concave lens
The relationship between the power of a lens and its focal length is ___________
Focal length + power = 0
Power = 1/focal length
Power = 2focal length
Power = focal length / 2
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 con cavo-convex 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
Thin at the centre with one surface plane
Which lens is converging?
Concave lens
convex lens
Both (a) and (b)
None of these
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
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.
First focus
Optical centre
Second focus
The power of a lens is +2.0 D. Find its focal length and state what kind of lens it is
5 cm, convex
50 cm, convex
5 cm, concave
50 cm, concave
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
Centre of curvature of first surface
A convexo - concave lens is
