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प्रश्न
Only one of the following applies to a concave lens. This is:
(a) focal length is positive
(b) image distance can be positive or negative
(c) height of image can be positive or negative
(d) image distance is always negative
उत्तर
image distance is always negative
Because a concave lens always forms a virtual image on the left side of the lens.
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संबंधित प्रश्न
State whether concave lens has a real focus or a virtual focus.
A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:
(a) a convergent beam of light
(b) a divergent beam of light
(c) a parallel beam of light
(d) a patch of coloured light
An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is diverging.
Construct ray diagrams to illustrate the formation of a virtual image using a converging lens,
When an object is kept at any distance in front of a concave lens, the image formed is always:
(a) virtual, erect and magnified
(b) virtual, inverted and diminished.
(c) virtual, erect and diminished
(d) virtual, erect and same size as object
What type of lens is used to correct
myopia?
A concave lens forms a magnified or diminished image depending on the distance of an object from it.
A lens forms an image between the object and the lens. Name the lens.
In figure give below of thin concave lens, F1 and F2 are its foci, complete the path of the given ray of light after it emerges out of the lens.
Define the principal focus of a concave lens.
