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प्रश्न
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
उत्तर
A parallel beam of light
The reason being, a beam of light coming from the focus of a converging lens becomes parallel, after refraction from the lens.
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संबंधित प्रश्न
Explain with the help of a diagram, why the concave lens is also called a diverging lens.
Define the principal focus of a concave lens.
Where must the object be placed for the image formed by a converging lens to be:
real, inverted and larger than the object?
If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from the lens, the image formed is slightly larger than object. The approximate focal length of the lens is ______.
What type of image is always made by a concave lens?
Things always look small on viewing through a lens. What is the nature of the lens?
Which of the following can form a virtual image which is always smaller than the object?
(a) a plane mirror
(b) a convex lens
(c) a concave lens
(d) a concave mirror
Explain the working of an astronomical telescope using refraction of light.
A virtual diminished image is formed when an object is placed between the optical centre and the principal focus of a lens.
(i) Name the type of lens which forms the above image.
(ii) Draw a ray diagram to show the formation of the image with the above stated characteristics.
Convex lens : converging : : concave lens : _______
