What will happen if the lens is lifted slowly up the plate?

What will happen if the lens is lifted slowly up the plate?

Answer. As the lens is lifted the difference in optical path between the two reflected rays will vary, thus slowly converting bright rings to dark and vice versa. This will be periodic change.

Why do the rings get closer and finer as we move away from the center?

Rings get closer as the order increases (m increases) since the diameter does not increase in the same proportion. In transmitted light the ring system is exactly complementary to the reflected ring system so that the centre spot is bright. The wavelength of monochromatic light can be determined as, .

Is it possible to determine the refractive index of the liquid by this experiment?

To find the refractive index of liquid: The experiment is performed when there is an air film between the plano-convex lens and the optically plane glass plate. Pour one or two drops of liquid whose refractive index is to be determined without disturbing the arrangement.

What is meant by refractive index of liquid?

Refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another. Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v.

What is the formula of refractive index of liquid?

The Refractive index of water is 1.3 and the refractive index of glass is 1.5. From the equation n = c/v, we know that the refractive index of a medium is inversely proportional to the velocity of light in that medium. Hence, light travels faster in water.

How do you prove Sini Sinr?

Snell s law (sin i/sin r) = (n1/ n2). Hence proved. Light rays bend towards the normal when it travels from rarer medium to denser medium. Where v1 = velocity in denser medium and v2 =velocity in rarer medium.

How do you prove IR?

Prove i=r in reflection ng Huygen’s principle,

1. Consider any point Q on the incident wavefront PA.
2. When the disturbance from P on incident wavefront reaches point , the disturbance from point Q reaches .
3. If c is velocity of light, then time taken by light to go from point Q to (via point K) is given by,

How do you verify experimentally that the angle of refraction?

Answer. Take a glass slab pass a ray of light through it observe the light at the boundary of the both of medium from rarer to denser it will bend towards normal forming an angle known as angle of incidence .