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प्रश्न
Define focal length.
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उत्तर
The distance between the pole and the principal focus is called the focal length (f) of a spherical mirror.
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संबंधित प्रश्न
Explain the following term related to spherical lenses:- optical centre
Define the following term in the context of spherical mirrors:- Centre of curvature
Explain the following term related to spherical lenses:- principal axis
A lens forms a real image 3 cm high of an object 1 cm high. If the separation of object and image is 15 cm, find the focal length of the lens.
State the kind of mirror used
(a) by a dentist, and
(b) as a street light reflector.
The focal length of a concave mirror is 10 cm. Find its radius of curvature.
What is a mirror formula?
Define the following terms in the context of a diverging mirror:
- Principal focus
- Focal length
Draw a labelled ray diagram to illustrate your answer.
