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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
Define the following term in the context of spherical mirrors:- Principal focus
A ray of light is incident normally on a plane mirror. What will be the
angle of reflection?
The diagram below in Figure, shows a convex mirror. C is its centre of curvature and F is its focus. (i) Draw two rays from A and hence locate the position of image of object OA. Label the image IB. (ii) State three characteristics of the image.
A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find
- the focal length of mirror
- position of image.
An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.
Define the following term in relation to concave mirror.
Pole
The following figure shows a concave mirror with its pole (P), focus (F), and center of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave mirror.
If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?
What is “aperture”?
