We know that lightwave emitted from an ordinary light source undergoes abrupt phase changes in time intervals of the order of 10-10 s. Thus, the light waves coming out from two independent light sources will not have any fixed phase ...
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Light sources which emit light waves of same wavelength (or frequency) having either zero or a constant originating phase difference are called coherent sources of light. Class 12 Physics Chapter 10 Wave Optics Session 2024-2025.
Modern telescopes prefer using concave mirror of large aperture as the objective instead of convex lens due to the following reasons: (1) There is no chromatic aberration in a mirror. (2) If the mirror is a parabolic mirror then even ...
Working of an optical fibre is based on the principle of total internal reflection of light. When a signal in the form of light is directed at one end of the fibre at a suitable angle, it undergoes repeated total ...
A large magnification can be achieved in an astronomical telescope by taking an objective lens of highest possible focal length and an eyepiece of least possible focal length. Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Session 2024-2025.