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प्रश्न
Explain the following term related to spherical lenses:- aperture
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उत्तर
Aperture:-
The diameter of sphere of part of which a lens is formed is called the aperture.
संबंधित प्रश्न
A virtual image larger than the object can be produced by a ______.
A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. The focal length of the lens is:
(a) 50 cm
(b) 40 cm
(c) 60 cm
(d) 30 cm
A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel.
The sun is seen before the sunrise and after the sunset.
Define linear magnification produced by a mirror?
Draw a ray diagram to show that a convex mirror has a wider field of view.
A concave mirror can be used to produce a parallel beam of light. Draw a ray to illustrate this.
An object 10 cm high is placed at a distance of 20 cm in front of a spherical mirror of focal length 25 cm. By scale drawing find the nature, position, and magnification of the image in the following case:
Concave mirror
Define focal length.
