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प्रश्न
Explain the following term related to spherical lenses: focal length
उत्तर
Focal Length:-
The focal length of a lens is the distance between optical centre and principal focus of the lens.
संबंधित प्रश्न
What type of image is formed:
in a plane mirror?
A diverging lens is used in:
(a) a magnifying glass
(b) a car to see objects on rear side
(c) spectacles for the correction of short sight
(d) a simple camera
A ray of light travels from a denser medium to a rarer medium. How will it bend?
Complete the following diagrams shown in Fig. by drawing the reflected ray for each of the incident ray A and B.
Write two more characteristics of the image.
Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.
Define the term Principal axis.
Geometric centre of the spherical mirror is ______.
In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm. The focal length of the objective, when the angular magnification of the telescope is 2, will be ______.
