Consider a point at focal point of a convergent lens. Another convergent lens of short focal length

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10.Wave Optics

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Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the nature of the wavefronts emerging from the final image ?

Option A

Option B

Option C

Option D

Solution

Here final image is point like which is formed at position I on the common axis of both the lenses. As this point lies on wavefront, it behaves like self independent secondary source and emits secondary spherical waves in all the directions. At a given instant of time, if we think of a surface, circumscribing to secondary spherical waves (i.e. a surface tangential from outside) then it gives us shape and position of new wavefront at that time. In the present case its shape is found to be spherical.

Standard 12

Physics

Figure, shows wave fronts in still water moving in the direction of the arrow towards the interface $PQ$ between a shallow region and a deep(denser) region. Which of the lines shown may represent one of the wave fronts in the deep region?

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A light beam is incident on a denser medium whose refractive index is $1.414$ at an angle of incidence $45^o$ . Find the ratio of width of refracted beam in a medium to the width of the incident beam in air

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(NEET-2017)

Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the nature of the wavefronts emerging from the final image ?

Solution

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Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the nature of the wavefronts emerging from the final image ?

Solution

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Figure, shows wave fronts in still water moving in the direction of the arrow towards the interface $PQ$ between a shallow region and a deep(denser) region. Which of the lines shown may represent one of the wave fronts in the deep region?

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