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Flashcards: Wave Optics
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Page 1 Wave Optics Flash cards Page 2 Wave Optics Flash cards Properties of light (continued) (i) It exists in the form of energy. (ii) It travels in straight line with speed 3 x 10 8 m/s in vacuum. (iii) It's speed is different in different medium. Page 3 Wave Optics Flash cards Properties of light (continued) (i) It exists in the form of energy. (ii) It travels in straight line with speed 3 x 10 8 m/s in vacuum. (iii) It's speed is different in different medium. Properties of light (iv) It exhibits the phenomenon of reflection, refraction, interference, diffraction, photo–electric effect etc. The phenomenon of interference and diffraction indicate the wave nature of light. Page 4 Wave Optics Flash cards Properties of light (continued) (i) It exists in the form of energy. (ii) It travels in straight line with speed 3 x 10 8 m/s in vacuum. (iii) It's speed is different in different medium. Properties of light (iv) It exhibits the phenomenon of reflection, refraction, interference, diffraction, photo–electric effect etc. The phenomenon of interference and diffraction indicate the wave nature of light. Wave Front The locus of all particles vibrating in the same phase is called wave–front. (a) Each point of wavefront is considered as source of secondary wavelets. (b) The ray of light is considered in the direction of outward normal to the wave front. Page 5 Wave Optics Flash cards Properties of light (continued) (i) It exists in the form of energy. (ii) It travels in straight line with speed 3 x 10 8 m/s in vacuum. (iii) It's speed is different in different medium. Properties of light (iv) It exhibits the phenomenon of reflection, refraction, interference, diffraction, photo–electric effect etc. The phenomenon of interference and diffraction indicate the wave nature of light. Wave Front The locus of all particles vibrating in the same phase is called wave–front. (a) Each point of wavefront is considered as source of secondary wavelets. (b) The ray of light is considered in the direction of outward normal to the wave front. Form of wave front Form of wavefront depends on nature of light source.Read More
FAQs on Flashcards: Wave Optics
| 1. What is the difference between interference and diffraction in wave optics? |  |
Ans. Interference occurs when two coherent waves overlap and combine to form patterns of constructive and destructive interference, while diffraction happens when a single wave bends around obstacles or passes through openings. Both phenomena demonstrate the wave nature of light, but interference requires two sources, whereas diffraction involves one wave encountering a barrier or aperture.
| 2. How do I calculate fringe width in Young's double slit experiment? | |
Ans. Fringe width is calculated using the formula β = λD/d, where λ is wavelength, D is the distance between the slits and screen, and d is the distance between the two slits. The fringe width remains constant across the interference pattern and directly increases with wavelength and screen distance, but decreases as slit separation increases.
| 3. Why does the colour of light matter in diffraction grating problems? | |
Ans. Different colours have different wavelengths, and diffraction gratings separate light based on wavelength using the grating equation nλ = d sinθ. Longer wavelengths (red light) diffract at larger angles than shorter wavelengths (violet light), which is why white light splits into its spectrum when passing through a grating.
| 4. What's the relationship between polarisation and transverse waves in CBSE Class 12 optics? | |
Ans. Polarisation proves that light is a transverse wave because oscillations occur perpendicular to the direction of propagation. Unpolarised light vibrates in all planes perpendicular to its path, but polarisers filter it to a single plane. This property doesn't occur in longitudinal waves and is crucial for understanding light behaviour at the molecular level.
| 5. Can single slit diffraction and double slit interference occur simultaneously in wave optics? | |
Ans. Yes, in Young's double slit experiment, each slit acts as a diffraction source, producing its own diffraction pattern. When these overlapping diffraction patterns interfere with each other, the result is a combined pattern where some bright fringes disappear at positions matching diffraction minima. Refer to flashcards and mind maps on EduRev to visualise these superimposed patterns clearly.
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