Fermat’s principle is of least time rather than of least distance. Would least distance apply as well for reflection? For refraction? Why are your answers different?

Q: plane wavefront is incident at an angle of 30° on the surface of the glass. Calculate the angle of…

A: Given : Angle of incidence, i = 30° Angle of refraction, r = 19°

Q: When you observe a mirage on a hot day, what are you actuallyseeing when you gaze at the “pool of…

A: Step 1 Mirage is the natural phenomenon that we generally see in the arid region. The water appears…

Q: А-Е H. 4. В -F Based on the image, which is NOT a wavelength? С -Е D- H

A: Wavelength is defined as distance between two successive crest or two successive troughs of wave.

Q: When you look at yourself in the mirror and wave your right hand, your beautiful image waves the…

A: The image produced by the plane mirrors is virtual and on the opposite side of the mirror. In the…

Q: Why does different material have different index of refraction?

A: Different material possess different refractive indices because of each material will have different…

Q: What is the advantage of having matte (nonglossy) pages in this book rather than pages with a…

A: Given:  pages in book

Q: How can a clear object be transparent and visible at the same time?

A: When we put the pure water in a extra clear glass, it makes transparent system of glass and water.…

Q: How is the law of reflection and refraction applied in health science?

A:

Q: How is the speed of light in glass affected by the succession of time delays that accompany the…

A: The light entering the glass, the photon interacts with the glass atom which sets into motion, this…

Q: Consider a layer of Oil, Glass, and Air where the oil/glass boundary is parallel to the glass/air…

A:

Q: Derive the law of reflection (θ'1 = θ1) from Fermat's principle.

A:

Q: What is the difference of speed of light in glass and speed of light in water?

A: Speed of the light in any medium depends upon the refractive index of the medium. Light travels at…

Q: What is total internal refraction and what is meant by optical fibre?

A: Total internal refraction is "When light rays travel from a more optically dense medium to a less…

Q: In which of the following medium the speed of light is maximum? Air Water Oil Alcohol

A: Speed of light in medium is given by, v=cn, n is refractive index of medium

Q: When a beam of white rays is dispersed by a prism which colour will be refracted to a larger extent

A:

Q: According to Huygens, how does every point on a wavefront behave?

A: Huygens’s principle states that we can geometrically construct the position of a wavefront at any…

Q: how to verify the law of refraction

A: Figure below shows the case of refraction

Q: The variation of index of refraction with a wavelength is called _________________, and it exists…

A: The variation of index of refraction with a wavelength is called dispersion.

Q: Does atmospheric refraction affect the length of the day? Would the daylight hours be longer or…

A: Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line…

Q: Light is incident from medium 1 to mediu the permeability of medium 2 is 3/4.

A: Given:- The brewster's angle = 55.40 The transmitted angle is =  34.60 The permeability of the…

Q: Which kind of road surface is easier to see when driving at night—a pebbled, uneven surface or a…

A:

Q: Does the law of reflection hold for curved mirrors? Explain.

A:

Q: Why is an object in water always appear to be at a depth shallower than it actually is?

A: When light ray falls on surface of varying medium, it produces phenomenon such as reflection and…

Q: Why does a clear pool of water always appears to be shallower than actual it is?

A: Let us assume a clear pool has a depth of 'd' meters.    To explain :  Why does the pool appears…

Q: When your eye is submerged in water, does the speed of light increase, decrease, or remain constant…

A: The refractive index of cornea is 1.376, while that of water is 1.33.

Q: What is mirage?

A: Mirage is an optical illusion commonly occur in deserts and hot roads. It is caused by refraction of…

Q: Will the angle of incidence and angle of reflection in a smooth surface change when it is reflected…

A: Let the angle of incidence in case of smooth surface = i Let the angle of reflection in case of…

Q: Give practical applications of total internal reflection?

A: To explain: Practical applications of total internal reflection.

Q: What will happen to the angle of refraction if light enters a medium of lower index of refraction

A:

Q: A spoon standing in a clear glass of water appears to be broken because water has a different…

A: A spoon standing in a clear glass of water appears to be broken because water has a different…

Q: In the opening photo of the duck standing on the rock, why are the duck’s feet not shown in the…

A: As the reflection occurs at same position, the image of the feet formed at same place. The object…

Q: When a fish in a pond looks upward at an angle of 45°, does it see the sky above the water’s surface…

A: A fish in the pond looks upwards at an angle of 45o.

Q: What is reflection? kindly answer it on your own understanding.

A: We have seen many live examples of reflections in our day to day life. Reflection can be of…

Q: With the help of Huygens’ construction, explain the phenomenon of diffraction

A: According to Huygen's wave theory, every point of wave front maybe regarded as source of light. When…

Q: Why is the index of refraction always greater than or equal to 1?

A: Refractive index of medium is the ratio of speed of light in vacuum to speed of light in a medium.…

Q: Why is everything backward in mirror?

A: The photons or the particles of light after hitting the smooth surface bounce back.

Q: An area with two identical lamps located above the clouds at a height of 30 ft and at a distance of…

A:

Q: Why does a high flying airplane cast little or no shadow on ground below while a low flying airplane…

A: An aeroplane cast little or no shadow when flying high above the ground whereas a low flying…

Dispersion of White Light

Snell’s law is a formula that gives a relation between the angle of incidence and angle of refraction and is given as: