Advertisements
Advertisements
प्रश्न
Answer the following question in detail.
How does magnifying power differ from linear or lateral magnification?
Advertisements
उत्तर
- The linear magnification is the ratio of the size of the image to the size of the object.
- When the distances of the object and image formed are very large as compared to the focal lengths of the instruments used, the magnification becomes infinite. Whereas, the magnifying power is the ratio of the angle subtended by the object and image, gives the finite value.
- For example, in the case of a compound microscope,
Mmin = `"D"/"f"=25/5` = 5 and Mmax = `1+"D"/"f"` = 6
Hence image appears to be only 5 to 6 times bigger for a lens of focal length 5 cm.
For Mmin = `"D"/"f"` = 5, v = ∞
∴ Lateral magnification (m) = `"v"/"u"` = ∞
Thus, the image size is infinite times that of the object but appears only 5 times bigger.
APPEARS IN
संबंधित प्रश्न
Define and describe the magnifying power of an optical instrument.
Answer the following question in detail.
Derive an expression for the magnifying power of a simple microscope. Obtain its minimum and maximum values in terms of its focal length.
Answer the following question in detail.
What is a terrestrial telescope and an astronomical telescope?
Answer the following question in detail.
Obtain the expressions for magnifying power and the length of an astronomical telescope under normal adjustments.
Answer the following question in detail.
What is the limitation in increasing the magnifying powers of a simple microscope?
What is the near point focusing?
Why is oil-immersed objective preferred in a microscope?
What is the use of collimator in a spectrmeter?
What are the uses of spectrometer?
What is myopia?
What is the remedy of hypermetropia?
What is astigmatism? What is its remedy?
Obtain the equation for resolving the power of the microscope.
Explain the experimental determination of the material of the prism using a spectrometer.
A compound microscope has a magnification of 30. The focal length of eye piece is 5 cm. Assuming the final image to be at least distance of distinct vision, find the magnification produced by the objective.
A compound microscope has a magnifying power of 100 when the image is formed at infinity. The objective has a focal length of 0.5 cm and the tube length is 6.5 cm. What is the focal length of the eyepiece.
A light wave of wavelength λ is incident on a slit of width d. The resulting diffraction pattern is observed on a screen at a distance D. If linear width of the principal maxima is equal to the width of the slit, then the distance D is
If astronomical telescope of length 1.53 m has magnifying power of magnitude 50, the values of fo and fe are ____________.
The magnifying power of a telescope is high if its objective and eyepiece have respectively ______.
A simple microscope is used to see the object first in blue light and then in red light. Due to the change from blue to red light, what is the effect on its magnifying power?
An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20. To the observer the tree appears:
A camera objective has an aperture diameter of d. If the aperture is reduced to diameter d/2, the exposure time under identical conditions of light should be made ______.
