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प्रश्न
Explain the following term related to spherical lenses: focal length
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उत्तर
Focal Length:-
The focal length of a lens is the distance between optical centre and principal focus of the lens.
संबंधित प्रश्न
Explain the following term related to spherical lenses:- centres of curvature
What happens when a ray of light falls normally (or perpendiculary) on the surface of a plane mirror?
How is a spherical mirror used to converge a beam of light at a point? Name the type of mirror used.
How is the focal length of a spherical mirror related to its radius of curvature?
An object 5 cm high is placed at a distance 60 cm in front of a concave mirror of focal length 10 cm. Find the position and size of the image.
Define the term principal focus in case of convex mirror. Draw a convex mirror and show its principal focus and focal length clearly.
What is the relation between focal length and radius of curvature of a concave mirror?
What is the relationship between the focal length and radius of curvature?
An object is placed in front of a concave mirror as shown in the following figure. By scale drawing, find the nature of the image. Given f = 10 cm, v = 30 cm.
