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प्रश्न
What is a lens?
उत्तर
A lens is an optical device that transmits and refracts a ray of light, and converges or diverges a beam of light.
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संबंधित प्रश्न
Where should an object be placed in front of a convex lens so as to obtain its virtual, erect and magnified image?
A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. The focal length of this combination of lenses will be:
(a) +10 cm
(b) +20 cm
(c) −10 cm
(d) −20 cm
In the following cases, where must an object be placed in front of a convex lens so that the image formed is of the same size as the object?
i. Which type of microscope has the arrangement of lenses shown in the adjoining figure?
ii. Label the figure correctly.
iii. Write the working of this microscope.
iv. Where does this microscope used?
v. Suggest a way to increase the efficiency of this microscope.
Point out the difference between a convex lens and a concave lens.
How will you decide whether a given piece of glass is a concave lens, convex lens, or a plane glass plate?
State the position of object, position of image, nature of image when: Convex lens is used as an erecting lens in terrestrial telescope.
A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as show in the figure. Which of the following could be inside the box?
Which of the following statements is true?
Distinguish between Concave lens and Convex lens.
