The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel and close to the axis, converge after reflection from the concave mirror.
The principal focus of a concave mirror is a point on its principal axis to which all the
light rays which are parallel and close to the axis, converge after reflection from the concave mirror.
For a normal human eye, this distance is 25 cm. The far point of the eye is the maximum distance to which the eye can see the objects clearly. The far point of the normal human eye is infinity.
For a normal human eye, this distance is 25 cm. The far point of the eye is the maximum distance to which the eye can see the objects clearly. The far point of the normal human eye is infinity.
The person is able to see nearby objects clearly, but he is unable to see objects beyond 1.2 m because the image formed in front of the retina. To correct this defect of vision, he must use a concave lens. The concave lens will bring the image back to the retina.
The person is able to see nearby objects clearly, but he is unable to see objects beyond
1.2 m because the image formed in front of the
retina.
To correct this defect of vision, he must use a concave lens. The concave lens will bring
the image back to the retina.
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Focal length = 2 x Radius of curvature = 2 x 20 cm = 10 cm
Focal length = 2 x Radius of curvature = 2 x 20 cm = 10 cm
See lessDefine the principal focus of a concave mirror.
The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel and close to the axis, converge after reflection from the concave mirror.
The principal focus of a concave mirror is a point on its principal axis to which all the
See lesslight rays which are parallel and close to the axis, converge after reflection from the concave mirror.
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
The child is suffering from myopia. This defect can be corrected by using a concave lens of suitable focal length.
The child is suffering from myopia. This defect
See lesscan be corrected by using a concave lens of suitable focal length.
What is the far point and near point of the human eye with normal vision?
For a normal human eye, this distance is 25 cm. The far point of the eye is the maximum distance to which the eye can see the objects clearly. The far point of the normal human eye is infinity.
For a normal human eye, this distance is 25 cm. The far point of the eye is the maximum distance to which the eye can see the objects clearly. The far point of the normal human eye is infinity.
See lessA person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
The person is able to see nearby objects clearly, but he is unable to see objects beyond 1.2 m because the image formed in front of the retina. To correct this defect of vision, he must use a concave lens. The concave lens will bring the image back to the retina.
The person is able to see nearby objects clearly, but he is unable to see objects beyond
See less1.2 m because the image formed in front of the
retina.
To correct this defect of vision, he must use a concave lens. The concave lens will bring
the image back to the retina.