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प्रश्न
Write the new Cartesian sign convention for spherical lenses.
State and explain the New Cartesian Sign Convention for spherical lenses.
उत्तर
New Cartesian Sign Convention for spherical lenses:
New Cartesian Sign Convention is used for measuring various distances in the ray diagrams of lenses.
According to this convention:
- Object is always placed on the left of the lens; i.e., light must fall on the lens from left to right.
- All distances parallel to the principal axis are measured from the optical centre of the lens.
- The distances along the direction of incident rays (along the positive x-axis) are taken as positive, whereas the distances opposite to the direction of incident rays (along the negative x-axis) are taken as negative.
- Distances measured above the principal axis (along the positive y-axis) are taken as positive.
- Distances measured below the principal axis (along the negative y-axis) are taken as negative.
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संबंधित प्रश्न
An image formed by a concave ______ cannot be obtained on a screen.
A concave lens always forms a virtual image.
A real image cannot be obtained on a screen.
Which type of lens forms always a virtual image?
Explain why, a stick half immersed in water appears to be bent at the surface. Draw a labelled diagram to illustrate your answer.
Two lenses A and B have power of (i) +2D and (ii) −4D respectively. What is the nature and focal length of each lens?
If a spherical lens has a power of, −0.25 D, the focal length of this lens will be :
(a) −4 cm
(b) −400 mm
(c) −4 m
(d) −40 cm
If a spherical lens has a power of, −0.25 D, the focal length of this lens will be :
(a) −4 cm
(b) −400 mm
(c) −4 m
(d) −40 cm
A convex lens forms an image of an object equal to the size of the object. Where is the object placed in front of the lens?
Complete the ray diagram to show how the rays pass into and out of the lens?
