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प्रश्न
Explain the following terms :
Pole, Centre of curvature, Radius of curvature, Principal axis. Show them on separate diagrams for each of the concave and convex mirrors.
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उत्तर
Pole: “The geometric centre of a spherical mirror is called POLE.”
Concave mirror Convex mirror
“The midpoint of aperture AB of the mirror is called pole.” P is pole of mirror.Centre of curvature: “The centre of a hollow sphere of which the mirror forms a part.” It is represented by the symbol ‘ C ‘
Concave mirror Convex mirror
Radius of curvature: “The radius of a hollow sphere of which the mirror is a part”. It is represented by ‘R’
Concave mirror Convex mirror
Principal axis: “Is a straight line joining the pole of the mirror to its centre of curvature and extended further.”
Concave mirror Convex mirror
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संबंधित प्रश्न
A concave mirror always forms a real image.
Name the two types of spherical mirrors. What type of mirror is represented by the:
back side of a shining steel spoon?
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
State the number of images of an object placed between two mirrors, formed in each case when mirrors are inclined to each other at (a) 90°, and (b) 60°.
Define the following term in relation to concave mirror.
Pole
The distance from the pole to the focus is called ______.
If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens?
Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?
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.
