What is the geometrical shape of the wavefront for light emerging out of a convex lens when a point-source is placed at the focus of the lens?

The shape of the wavefront in case of a light emerging out of a convex lens when a point source is placed at its focus is a parallel wave front as shown in the figure. The light from the source at the focus of a lens will emerge parallel and will form a plane wave front following the Huygens' principle.

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ISC Physics Class 12, Part-2>Chapter 6 - Wave Nature of Light : Huygens' Principle>QUESTIONS>Q 13

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Yellow light of wavelength $600 nm$ is incident on a boundary separating air and glass. Find the speed, wavelength and frequency of refracted light. The refractive index of glass for yellow light is $1.5$ .

Important Questions on Wave Nature of Light : Huygens' Principle

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ISC Physics Class 12, Part-2>Chapter 6 - Wave Nature of Light : Huygens' Principle>QUESTIONS>Q 1

Which of the following does not support the wave nature of light?

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ISC Physics Class 12, Part-2>Chapter 6 - Wave Nature of Light : Huygens' Principle>QUESTIONS>Q 2

Which of the following properties of light conclusively support wave nature of light?

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ISC Physics Class 12, Part-2>Chapter 6 - Wave Nature of Light : Huygens' Principle>QUESTIONS>Q 3

A plane wavefront is generated by:

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ISC Physics Class 12, Part-2>Chapter 6 - Wave Nature of Light : Huygens' Principle>QUESTIONS>Q 4

Two points are situated at the same distance from a light source but in opposite directions. What is phase difference between the light waves from the two points?

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ISC Physics Class 12, Part-2>Chapter 6 - Wave Nature of Light : Huygens' Principle>QUESTIONS>Q 5

What does the speed of light in vacuum depends on?

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ISC Physics Class 12, Part-2>Chapter 6 - Wave Nature of Light : Huygens' Principle>QUESTIONS>Q 6

Which colour of light travels slowest in glass ?

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ISC Physics Class 12, Part-2>Chapter 6 - Wave Nature of Light : Huygens' Principle>QUESTIONS>Q 7

The index of refraction of a medium is $1.5$ . If the speed of light in air is $3 .0 \times 10^{8} {ms}^{- 1}$ , then what is speed of lights in the given medium ?