Question

Good night ! To All
Hey guys ....

I had a problem can anyone help me....

• When the two media is invisible ?
• What is the difference between reflection , refraction and dispersion of light ?
• what is the refractive and absolute refractive index differences and formula ?
• what are the rule of refraction .show it with the help of a diagram?
• Define the following given :
-optical center
-Focus
-Centres of curvature
-Radii of curvature
-apertune
-spectrum
-lenses
• which type of lens form it:
an inverted and mag image .
an erect and mag image.
an inverted and dim image.
an erect and dim image.


Hope people will help me...
in a distress situation...
plz help .......
$any \: phy \: genius \: plz \: tell \: me......$

Answer 1

Hey mate here is your answer ✍✍✍✍....
⏩⏩⏩....... good night ..........⏪⏪⏪

✴ When a ray of light is not refracted . The boundary between the two media is not visible . If the refractive indices of two medium are equal ...☺☺

✴ difference between them:
▶reflection : T he phenomenon of bonusing back of ray of light in a plane medium is called reflection of light ....
▶ Refraction : The phenomenon of the bending of the path of a ray of light , when it obliquely passes through one optically transparent medium to another medium is called refraction of light...
▶ Dispersion : The phenomenon of spilling up of white light into its seven concurrent colours when goes through transparent medium like glass prism dispersion take place...

✴ Difference between them :
▶Refractive index : The refractive index of a medium is the ratio of the speed of the light from one medium to speed of the light in second medium ...

$\frac{speed \: of \: light \: in \: medium \: 1}{speed \: of \: light \: in \: medium \: 2} = \frac{v {1}^{} }{v {}^{2} }$

▶ Absolute refractive index : It is a ratio of speed of light in air or vaccum to the speed of light in the given medium like glass , water etc is called absolute refractive index ...
$\frac{ speed \: of \: light \: in \: air \: }{ \: speed \: of \: light \: in \: the \: given \: medium} = \frac{c}{ {v}^{m} }$☺☺

✴Rule of refraction :
When ray of light goes through
1.) rarer medium to denser
• bends towards normal.....
2.) denser medium to rarer
• bends away from the normal....☺☺

✴ definition :
▶optical centre : The special point lies on the middle of the lens through which a ray of light goes straight is called optical centre....
▶ Focus ( F1 and F2) : The spherical point lies on the principal axis , through which an incident ray parellel to the principal axis after refractiin is called focus...
▶ centre of curvature : The centre of the spherical glass , from which the lens is made called centre of curvature ( c¹ and c² )....
▶ radii of curvature : The distance between optical centre and centre of curvature called radii of curvature i.e R¹ and R²....
▶ aperture : The diameter or size of a lenses is called aperture...
▶ spectrum : The band of seven colour i.e VIBGYOR is called spectrum...
▶lenses : A circular piece of solid spherical glass has at least one surface as spherical is called the lens.☺☺☺

✴ The name of the lens are➡➡➡
▶ convex lens
▶ convex lens
▶convex lens
▶ concave lens ....☺☺

⏩hope it will help you⏪
⏩Plz mark it as braniliest ⏪
➡➡➡➡@ be brainly ❤❤
$................end...................$✔✔✔✔✔

Answer 2

Step-by-step explanation:

• 1)when a ray of light is not refracted.the boundary between the two media is not visible.if the refractive indices of two medium are equal.
• 2)Reflection takes place when the light does not pass into the material, but is instead "bounced" off the surface. Refraction occurs when the light passes into the material. ... Dispersion occurs when different wavelengths of light are refracted different amounts, separating the light into its constituent colors.
• 3)Relative refractive index: When light travels from one medium to another medium, then the refractive index is known as the relative refractive index. Absolute refractive index: When light travels from vacuum to another medium, then the refractive index is known as the absolute refractive index.
• 4)The diagram below illustrates the law of reflection. In the diagram, the ray of light approaching the mirror is known as the incident ray (labeled I in the diagram). ... The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.
• ______________________________
• 5.. 1. a point on the axis of a lens that is so located that any ray of light passing through it in passing through the lens suffers no net deviation and that may be within, without, or on either surface of the lens.
• 2. a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the focus of all diplomatic efforts. Physics. a point at which rays of light, heat, or other radiation meet after being refracted or reflected.
• 3. In geometry, the center of curvature of a curve is found at a point that is at a distance from the curve equal to the radius of curvature lying on the normal vector. It is the point at infinity if the curvature is zero. The osculating circle to the curve is centered at the centre of curvature.
• 4. the absolute value of the reciprocal of the curvature of a curve at a given point; the radius of a circle the curvature of which is equal to that of the given curve at that pointSee also centre of curvature. WORD OF THE DAY.
• 5. Aperture refers to the opening of a lens's diaphragm through which light passes. ... Lower f/stops give more exposure because they represent the larger apertures, while the higher f/stops give less exposure because they represent smaller apertures.
• 6. A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without steps, across a continuum. The word was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism.
• 7. a piece of transparent substance, usually glass, having two opposite surfaces either both curved or one curved and one plane, used in an optical device in changing the convergence of light rays, as for magnification, or in correcting defects of vision.
• _____________________________

• 6. )convex lens. A convex lens form inverted and diminished image when object is placed beyond.