D. C. Pandey Solutions for Chapter: Interference and Diffraction of Light, Exercise 16: Objective Problems [Level 1]

In the diffraction pattern of single slit under bichromatic illumination, the first minimum with the wavelength ${\lambda }_1$ is found to be coincident with the third maximum at ${\lambda }_2.$ So

The first diffraction minima due to single slit diffraction is at $\theta =30°$ for a light of wavelength $5000 \mathrm{\AA }$. The width of the slit is:

In a wave, the path difference corresponding to a phase difference of $\varphi$ is:

The phase difference between the incident wave and reflected wave is $180°$, when a light ray

The main difference in the phenomenon of interference and diffraction is that:

Two sources are called coherent, if they produce waves:

Huygen's wave theory of light cannot explain:

When light waves suffer reflection at the interface between air and glass, the change of the phase of the reflected wave is equal to: