Physics
Grade-10
Easy
Question
The central point of a lens is called its _____.
- Pole
- Center of curvature
- Optical center
- Focal point
Hint:
The point through which light always passes without any deviation is the optical center.
The correct answer is: Optical center
The central point of a lens is the optical center.
- The optical center refers the center point of the lens.
- This lies in the line of the principle axis.
- The optical center is denoted as O.
- The measurement for the focal length of a lens is calculated from the optical center.
- The center of a lens always lies within the lens and not away the lens.
- It can be easily found by projecting some light over the lens.
Related Questions to study
Physics
The diameter of the outer edge of a lens is called the ____.
The diameter of the outer edge of a lens is called the ____.
PhysicsGrade-10
Physics
Analyse from the picture and find out the substance that has the highest refractive index.
Analyse from the picture and find out the substance that has the highest refractive index.
PhysicsGrade-10
Physics
In which of the following purposes lenses are not used?
In which of the following purposes lenses are not used?
PhysicsGrade-10
Physics
A light ray enters medium 2 from medium 1. If the medium 2 has a refractive index greater than medium 1, the light ray would _____ on entering medium 2.
A light ray enters medium 2 from medium 1. If the medium 2 has a refractive index greater than medium 1, the light ray would _____ on entering medium 2.
PhysicsGrade-10
Physics
Refraction of light takes place because of the _____ that light encounters on passing from one medium to another.
Refraction of light takes place because of the _____ that light encounters on passing from one medium to another.
PhysicsGrade-10
Physics
The absolute refractive index of glass is ___.
The absolute refractive index of glass is ___.
PhysicsGrade-10
Physics
The refractive index of a pair of medium depends upon the speed of light in ____.
The refractive index of a pair of medium depends upon the speed of light in ____.
PhysicsGrade-10
Physics
The speed of light in glass is ____ that in water.
The speed of light in glass is ____ that in water.
PhysicsGrade-10
Physics
The absolute refractive index is the refractive index of a material medium w.r.t _____.
The absolute refractive index is the refractive index of a material medium w.r.t _____.
PhysicsGrade-10
Physics
The speed of light in glass is ____ that in the air.
The speed of light in glass is ____ that in the air.
PhysicsGrade-10
Physics
What is the SI unit of measurement of refractive index of a medium?
What is the SI unit of measurement of refractive index of a medium?
PhysicsGrade-10
Physics
The refractive index of any medium is ____.
The refractive index of any medium is ____.
PhysicsGrade-10
Physics
The refractive index of air is ____.
The refractive index of air is ____.
PhysicsGrade-10
Physics
The speed of light in a vacuum is ______ m/s.
The speed of light in a vacuum is ______ m/s.
PhysicsGrade-10
Physics
The radius of curvature of a convex mirror is taken to be _____.
the center of curvature and focus lies behind the convex mirror, hence the signs are taken as positive.
The radius of curvature of a convex mirror is taken to be _____.
PhysicsGrade-10
the center of curvature and focus lies behind the convex mirror, hence the signs are taken as positive.
