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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
Image formed by a convex ______ is always virtual and smaller in size.
We can obtain an enlarged and erect image by a convex mirror.
A 2.0 cm tall object is placed 40 cm from a diverging lens of focal length 15 cm. Find the position and size of the image.
State the kind of mirror used
(a) by a dentist, and
(b) as a street light reflector.
Name the kind of mirror used to obtain:
A real and diminished image.
How is the focal length of a spherical mirror related to its radius of curvature?
The sun is seen before the sunrise and after the sunset.
What is a mirror formula?
A converging lens of focal length f is placed at a distance 0.3 m from an object to produce an image on a screen 0.9 m from the lens. With the object and the screen in the same positions, an image of the object could also be produced on the screen by placing a converging lens of focal length.
