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प्रश्न
Define the following term in the context of spherical mirrors:- Principal focus
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उत्तर
Principal focus of a spherical mirror:-
The focus (F) is the point on the principal axis of a spherical mirror where all the incident rays parallel to the principal axis meet or appear to diverge from after reflection.
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संबंधित प्रश्न
A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option)
(A) Convex lens of focal length 10 cm.
(B) Convex lens of radius of curvature 20 cm.
(C) Convex lens of focal length 20 cm.
(D) Concave mirror of focal length 20 cm.
Explain the following term related to spherical lenses: focal length
The diverging lens in part (a) is replaced by a converging lens also of focal length 100 mm. The object remains in the same position and an image is formed by the converging lens. Compare two properties of this image with those of the image formed by the diverging lens in part (a).
Write true or false
A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
How is a spherical mirror used to diverge a beam of light from a point? Name the type of mirror used.
How is the focal length of a spherical mirror related to its radius of curvature?
Define the following term in relation to concave mirror.
Center of curvature
Find the height of the image of a body of height 1.5m in a mirror with a magnification of 1.5.
