Which lens is converging?
Concave lens
convex lens
Both (a) and (b)
None of these
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
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?
Optical centre
First focal point
Second focal point
Which is diverging lens?
All of these
Concavo convex lens
equi-convex lens
Equi concave lens
On reducing the focal length of a lens its power
Doesnot change
Nothing can ve said
Decreases
Increases
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
Second focus
Which lens is diverging?
Convex 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 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
