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प्रश्न
An object is placed in front of a converging lens. Obtain the conditions under which the magnification produced by the lens is
- negative and
- positive.
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उत्तर
- Magnification is negative for the real image formed by a convex lens.
- Magnification is positive for the virtual image formed by a convex lens.
संबंधित प्रश्न
Calculate the focal length of a corrective lens having power +2D.
Define the power of a lens.
Find the focal length of a lens of power −2.0 D. What type of lens is this?
The power of a lens is, −2 D. What is its focal length?
What is the nature of a lens whose power is, −4 D?
A normal eye is not able to see objects closer than 25 cm because
Complete the diagram to show the formation of the image of the object AB.
(i) Name the Lens LL’.
(ii) Where is the image of the object AB formed?
(iii) State three characteristics of the image.
If there is a convex lens of focal length 75 cm and a concave lens of focal length 40 cm, then calculate their combined power and combined focal length.
Increase in the converging power of eye lens cause ‘hypermetropia'
An object is kept at a distance of 1m from a lens of power +2D:
- Identify the type of lens.
- Calculate its focal length and distance of the image formed.
