Question

Rakesh who lives in the deserts of Rajasthan usually observes an optical illusion on a hot summer day. He asks his friend who is a physics teacher about this phenomenon. Name the phenomenon due to which illusion takes place and explain it. Which value is shown by Rakesh?

Answer 1

Hint : An optical illusion is a type of visual illusion created by the visual system and defined by a visual experience that appears to be different from reality. Illusions appear in a broad range of forms; categorization is difficult because the underlying reason is frequently unknown, but a taxonomy provided by Richard Gregory serves as a useful guide.

Complete Step By Step Answer:
Diffraction is a term that describes a variety of events that occur when a wave collides with an obstruction or an opening. The bending of waves around the corners of an obstruction or through an aperture into the geometrical shadow of the barrier/aperture is defined as. When a light wave is impeded in any manner, this phenomena happens. When a tiny aperture or object blocks light waves, diffraction fringes appear. The optical phenomena in which light is separated into its constituent components by a grating. Various wavelengths of light pass through or reflect from a grating at different angles due to diffraction, allowing a spectrometer to segregate and quantify wavelength intensity. The optical illusion is caused by the refraction (bending) of light as it goes from air to water: straws in a glass of water seem broken or twisted at the water's surface. Refraction can also produce rainbows. The Huygens–Fresnel principle, which treats each point in a propagating wavefront as a collection of discrete spherical wavelets, describes the diffraction phenomena in classical physics. When a coherent source (such as a laser) contacts a slit/aperture that is equivalent in size to its wavelength, as seen in the included image, the distinctive bending pattern is most prominent.
Hence, Diffraction is the answer.
Value shown by rakesh
-Thirst to learn.
-Application orientated approach.
-Nature lover.

Note :
In classical physics diffraction arises because of the way in which waves propagate; this is described by the Huygens–Fresnel principle and the principle of superposition of waves. The propagation of a wave can be visualized by considering every particle of the transmitted medium on a wavefront as a point source for a secondary spherical wave.