Light energy is redistributed in
diffraction and interference
In interference, superposed coherent waves produce bright and dark fringes: energy missing at minima appears at maxima.
In diffraction, light bending around an obstacle or slit forms a central maximum and weaker secondary maxima with minima between them.
In both cases the total energy is conserved and only redistributed across the pattern.
Hence, diffraction and interference.
Similar Questions
The intensity of a polarized light can be controlled by a second polarizer from
The eye defect astigmatism can be corrected by using a
In Huygens construction, the secondary wavelets move
The phenomenon of diffraction is most significant when the slit width is
When a beam of white light enters into an optical prism, the most deviated colour is
An unpolarized light incident on a plane glass surface gets totally polarized on reflection. If the refractive index of glass is \(\tan 57^{\circ}\), then the angle of refraction is
Chromatic aberration arises in thick lenses due to
In Young’s double slit experiment using a source of wavelength \(\lambda\) interference bands are observed on a screen. If the separation between the slits alone is halved in this experiment, then the angular separation \(\omega\) of the fringes on the screen becomes
The ratio of the speed of light in vacuum to that in a medium is called
The distance of an object placed in front of a concave mirror of radius of curvature 24 cm that gives its magnification as 3 is
Important Questions from Optics
- A collimated beam of light of diameter $2 \text{ mm}$ is propagating along x-axis. The beam is required to be expanded in a collimated beam of diameter $14 \text{ mm}$ using a system of two convex lenses. If first lens has focal length $40 \text{ mm}$, then the focal length of second lens is ____________ $\text{mm}$.
- In a Young's double slit experiment set up, the two slits are kept $0.4\text{ mm}$ apart and screen is placed at $1\text{ m}$ from slits. If a thin transparent sheet of thickness $20 \, \mu\text{m}$ is introduced in front of one of the slits then center bright fringe shifts by $20\text{ mm}$ on the screen. The refractive index of transparent sheet is given by $\frac{\alpha}{10}$, where $\alpha$ is __________.
- In two separate Young's double-slit experimental set-ups and two monochromatic light sources of different wavelengths are used to get fringes of equal width. The ratios of the slits separations and that of the wavelengths of light used are $2 : 1$ and $1 : 2$ respectively. The corresponding ratio of the distances between the slits and the respective screens ($D_1/D_2$) is ___________.
- The size of the images of an object, formed by a thin lens are equal when the object is placed at two different positions $8 \text{ cm}$ and $24 \text{ cm}$ from the lens. The focal length of the lens is ________ $\text{cm}$.
- A ray of light travelling in air is incident on one face of a parallel glass slab of thickness $t$ and refractive index $\mu$ at an angle of incidence $i$. Total time spent by the ray inside the slab is
