Write the important characteristic features by which the interference can be distinguished from the observed diffraction pattern.
OR
Explain the basic differences between the construction and working of a telescope and a microscope.
Write the important characteristic features by which the interference can be distinguished from the observed diffraction pattern.
OR
Explain the basic differences between the construction and working of a telescope and a microscope.
Important characteristic features:
1. Interference is the result of the interaction of light coming from two different waves originating from two coherent sources, whereas the diffraction pattern is the result of the interaction of light coming from different parts of the same wavefront
2. The fringes may or may not be of the same width in case of interference, while the fringes are always of varying width in diffraction.
3. In interference, the fringes of minimum intensity are perfectly dark and all bright fringes are of the same intensity. In diffraction, the fringes of minimum intensity are not perfectly dark and the bright fringes are of varying intensity
4. There is a good contrast between the bright and dark fringes in the interference pattern. The contrast between the bright and dark fringes in the diffraction pattern is comparatively poor.
OR
TelescopeMicroscopeIt is used for observing distant images of heavenly bodies such as stars and planetsIt is used for observing magnifying images of tiny objects.The objective lens has a large focal length and large aperture.The objective lens has a small focal length and short apertureThe eye lens used has small focal length and small apertureThe eye lens used has moderate focal length and large aperture.The distance between the objective lens andeye lens is adjusted to focus the object situated at infinity.The objective and eye lens are kept at a fixed distance apart,where as the distance of the objective lens from the object is adjusted to focus an object
Important characteristic features:
1. Interference is the result of the interaction of light coming from two different waves originating from two coherent sources, whereas the diffraction pattern is the result of the interaction of light coming from different parts of the same wavefront
2. The fringes may or may not be of the same width in case of interference, while the fringes are always of varying width in diffraction.
3. In interference, the fringes of minimum intensity are perfectly dark and all bright fringes are of the same intensity. In diffraction, the fringes of minimum intensity are not perfectly dark and the bright fringes are of varying intensity
4. There is a good contrast between the bright and dark fringes in the interference pattern. The contrast between the bright and dark fringes in the diffraction pattern is comparatively poor.
OR
TelescopeMicroscopeIt is used for observing distant images of heavenly bodies such as stars and planetsIt is used for observing magnifying images of tiny objects.The objective lens has a large focal length and large aperture.The objective lens has a small focal length and short apertureThe eye lens used has small focal length and small apertureThe eye lens used has moderate focal length and large aperture.The distance between the objective lens andeye lens is adjusted to focus the object situated at infinity.The objective and eye lens are kept at a fixed distance apart,where as the distance of the objective lens from the object is adjusted to focus an object
