The spherical surface of lens results in ………
a) having a wide range of focal length.
b) Having a narrow range of focal length
c) Having a wide range of curvature.
d) Having a narrow range of curvature
Out of the following which one is diverging or negative lens?
a) Biconvex.
b) Plano-convex
c) Biconcave
d) Positive meniscus
Where does the principal axis intersect the two refracting surfaces?
a) Front vertex and back vertex
b) Focal length
c) Radius of curvature
d) Principal focus
Name the bending of light, if the beam of light passes obliquely from one medium to another.
a) Refraction
b) Dispersion
c) Reflection
d) Deviation
From which part of the lens, the ray of light passes without deviation
a) Optical center
b) Focus
c) Centre of curvature
d) Pole
Each surface of a lens is a part of a sphere, the center of which is called as: NTS PST (B) -------2021
a) Optical center
b) center of curvature
c) focal point
d) Principal focus
