Single Choice

As the beam enters the medium, it will

Adiverge
Bconverge
Correct Answer
Cdiverge near the axis and converge near the periphery
Dtravel as a cylindrical beam

Solution

As intensity is maximum at axis,
$$\cdot$$.$$\mu$$ will be maximum and speed will be minimum on the axis of the beam. Also the R.I will decrease radially. Hence the beam will converge

SIMILAR QUESTIONS

Optics

The critical angle of medium for specific wavelength, if the medium has relative permittivity $$3$$ and relative permeability $$\dfrac{4}{3}$$ for this wavelength, will be:

Optics

A point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is $$30cm$$ and the refractive index of the lens material is $$1.5$$, then the focal length of the lens (in cm) is ________.

Optics

An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical representation of the magnitude of linear magnification ($$m$$) versus distance of the object from the mirror ($$x$$) is correctly given by (Graphs are drawn schematically and are not to scale)

Optics

An upright object is placed at a distance of $$40\ cm$$ in front of a convergent lens of focal length $$20\ cm$$. A convergent mirror of focal length $$10\ cm$$ is placed at a distance of $$60\ cm$$ on the other side of the lens. The position and size of the final image will be

Optics

One plano-convex and one plano-concave lens of same radius of curvature $$'R'$$ but of different materials are joined side by side as shown in the figure. If the refractive index of the material of $$1$$ is $$\mu_1$$ and that of $$2$$ is $$\mu_2$$ is:

Optics

A biconvex lens has a radius of curvature of magnitude $$20\ cm$$. Which one of the following options best describe the image formed of an object of height $$2\ cm$$ placed $$30\ cm$$ from the lens?

Optics

An air bubble in a glass with refractive index $$1.5$$ (near normal incidence) i.e. $$5\ cm$$ deep when viewed from one surface and $$3\ cm$$ deep when viewed from the opposite face. The thickness(in $$cm$$) of the is.

Optics

Which colour of the light has the longest wavelength ?

Optics

For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distance between the retina and the cornea-eye lens can be estimated to be

Optics

A transparent slab of thickness d has a refractive index n(z) that increases with z. Here z is the vertical distance inside the slab, measured from the top. The slab is placed between two media with uniform refractive indices $${ n }_{ 1 }$$ and $${ n }_{ 2 }$$ $$(>{ n }_{ 1 })$$, as shown in the figure. A ray of light incident with angle $${ \theta }_{ i }$$ from medium 1 and emerges in medium 2 with refraction angle $${ \theta }_{ f }$$ with lateral displacement $$l$$. Which of the following statement(s) is (are) true?

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