Laws of Reflection and Refraction

Which of the following bearings and their uses are correct?

The reason for using lead glass in the preparation of lenses is ,it is

When a monochromatic light ray is incident on a medium of refractive index $\mu$ with an angle of incidence ${\theta }_i$, the angle of refraction is ${\theta }_r$. If ${\theta }_i$ is changed slightly by $\Delta {\theta }_i$, then the corresponding change in ${\theta }_r$ will be

A ray of light moving along the unit vector $(–\hat{\mathrm{i}}–2\hat{\mathrm{j}})$ undergoes refraction at an interface of two media, which is the $x-z$ plane. The refractive index for $y>0$ is $2$ while for $y<0$, it is $\frac{\sqrt{5}}{2}$ . The unit vector along which the refracted ray moves is 

A ray of sunlight enters a spherical water droplet ($n =\frac{4}{3}$) at an angle of incidence $53°$ measured with respect to the normal to the surface. It is reflected from the back surface of the droplet and re-enters into the air. The angle between the incoming and outgoing ray is [Take $\sin 53° = 0.8$]

A man of height $h$ is walking away from a street lamp with a constant speed $v$. The height of the street lamp is $3h$. The rate at which of the length of the man's shadow is increasing when he is at a distance $10h$ from the base of the street lamp is:

The diagram shows five isosceles right angled prisms. A light ray incident at 90^o at the first face emerges at same angle with the normal from the last face. which of the following relations will hold regarding the refractive indices?

A surveyor on one bank of canal observed the image of the 4 inch and 17 ft marks on a vertical staff, which is partially immersed in the water and held against the bank directly opposite to him, coincides. If the 17 ft mark and the surveyor's eye are both 6 ft above the water level, If the width of the canal is 10 + x, assuming that the refractive index of the water is 4/3, then find the value of x. Zero mark is at the bottom of the canal.

A surveyor on one bank of canal observed the image of the 4 inch and 17 ft marks on a vertical staff, which is partially immersed in the water and held against the bank directly opposite to him, coincides. If the 17 ft mark and the surveyor's eye are both 6 ft above the water level, If the width of the canal is 10 + x, assuming that the refractive index of the water is 4/3, then find the value of x. Zero mark is at the bottom of the canal.

A beam of parallel rays of width b propagates in glass at over to air this face is _________  if the refractive index of glass is μ.v

When light travels from a rarer to a denser medium, which of the following parameter of light decreases:

A ray of light passes through four transparent media with refractive indices ${\mu }_1, {\mu }_2, {\mu }_3$ and ${\mu }_4$ as shown in the figure. The surfaces of all media are parallel. If the emergent ray $CD$ is parallel to the incident ray $AB$, we must have

A monochromatic beam of light of wavelength $6000 Å$ in vacuum enters a medium of refractive index $1.5$. In the medium its wavelength is __________, its frequency is ____________

When a ray of light enters a glass slab from air

A light of wavelength $6000\mathrm{\AA }$ in air, enters a medium with refractive index $1.5$. Inside the medium its frequency is $5\times {10}^{14} \mathrm{Hz}$ and its wavelength is_______ $\mathrm{\AA }$.

If ${\epsilon }_0$ and ${\mu }_0$ are, respectively, the electric permittivity and magnetic permeability of free space, $\epsilon$ and $\mu$ the corresponding quantities in a medium, the index of refraction of the medium in terms of the above parameters is

A light wave of frequency  $5\times 10^{14} \mathrm{Hz}$ enters a medium of refractive index $1.5$. In the medium the velocity of the light wave is ________________ and its wavelength is ______________

What is a point object in light?

What is the point object?