In a single slit diffraction pattern,identify the incorrect statement from the following.

The luminous border that surrounds the profile of a mountain just before the sun rises behind it is an example of:

Light is incident normally on a diffraction grating through which the first order diffraction is seen at $32^\circ$. The second order diffraction will be seen at

In an experiment,electrons are made to pass through a narrow slit of width $'d'$ comparable to their de-Broglie wavelength. They are detected on a screen at a distance $'D'$ from the slit (see figure). Which of the following graphs can be expected to represent the number of electrons $'N'$ detected as a function of the detector position $'y'$ ($y = 0$ corresponds to the middle of the slit)?

The phenomenon that explains why light waves do not travel in a straight line is known as .......

Diffraction of light occurs only when the dimension of the obstacle is .....