Physics
Grade-10
Easy
Question
A convex lens is of radius of curvature 104 cm. A parallel beam of light shone on the lens converges to a point at a distance of ____ cm from the optic center.
Hint:
Principal focus or focus represents the point at which the emerging rays are converging.
Hence, for a convex lens, the radius of curvature R= 2f
The correct answer is: 52
A convex lens is of radius of curvature 104 cm. A parallel beam of light shone on the lens converges to a point at a distance of 52 cm from the optic center.
- The point at which the emerging rays are converging or concentrating is called the principal focus.
- The radius is considered 2f.
- The focal length can be calculated by the formula f= R/2.
- When R is 104 cm, the focal length is 104/2= 52 cm.
Related Questions to study
Physics
Focal length of one side of a biconcave lens is 76 cm. Its second focal length would measure ____ cm.
Focal length of one side of a biconcave lens is 76 cm. Its second focal length would measure ____ cm.
PhysicsGrade-10
Physics
The focal length of a concave lens whose radius of curvature is 76 cm is ____ cm.
The focal length of a concave lens whose radius of curvature is 76 cm is ____ cm.
PhysicsGrade-10
Physics
The radius of curvature of a convex lens whose focal length is 25 cm is ____ cm.
The radius of curvature of a convex lens whose focal length is 25 cm is ____ cm.
PhysicsGrade-10
Physics
In which of the following cases does the light ray not bend while getting refracted through a spherical lens?
In which of the following cases does the light ray not bend while getting refracted through a spherical lens?
PhysicsGrade-10
Physics
A light ray passing through the optical center of a lens ____.
A light ray passing through the optical center of a lens ____.
PhysicsGrade-10
Physics
In case of refraction through a concave lens, the emergent ray is _____ to the incident ray.
In case of refraction through a concave lens, the emergent ray is _____ to the incident ray.
PhysicsGrade-10
Physics
A convex lens in a magnifying glass can be used to focus the Sun’s light rays onto a paper, which lights up a fire after some time. What would happen if the magnifying glass were replaced with a concave lens?
A convex lens in a magnifying glass can be used to focus the Sun’s light rays onto a paper, which lights up a fire after some time. What would happen if the magnifying glass were replaced with a concave lens?
PhysicsGrade-10
Physics
Concave and convex lenses are also called _____ and _____ lenses respectively.
Concave and convex lenses are also called _____ and _____ lenses respectively.
PhysicsGrade-10
Physics
The curved surface in spherical surface is a _____ surface.
The curved surface in spherical surface is a _____ surface.
PhysicsGrade-10
Physics
A concave lens is of radius of curvature 94 cm. A parallel beam of light shone on the lens appears to diverge from a point at a distance of ____ cm from the optic center.
A concave lens is of radius of curvature 94 cm. A parallel beam of light shone on the lens appears to diverge from a point at a distance of ____ cm from the optic center.
PhysicsGrade-10
Physics
Focal length of one side of a biconvex lens is 56 cm. Its second focal length would measure ____ cm.
Focal length of one side of a biconvex lens is 56 cm. Its second focal length would measure ____ cm.
PhysicsGrade-10
Physics
The focal length of a concave lens whose radius of curvature is 26 cm is ____ cm.
The focal length of a concave lens whose radius of curvature is 26 cm is ____ cm.
PhysicsGrade-10
Physics
A parallel beam of light when passes through a concave lens ____.
A parallel beam of light when passes through a concave lens ____.
PhysicsGrade-10
Physics
The refraction through a spherical lens is different from the refraction through a glass slab in which of the following ways?
The refraction through a spherical lens is different from the refraction through a glass slab in which of the following ways?
PhysicsGrade-10
Physics
Light travelling from air to which of the following mediums bends away from the normal?
Light travelling from air to which of the following mediums bends away from the normal?
PhysicsGrade-10
