Question

annyeonghaseyo!
1.what is a refractive index?
2.The distance between a pencil and it's image in a plane mirror is 5 m if the pencilmoves 2 m away from the mirror then what will be be the distance betweenthe pencil and its image?

Any kpopper ?

Answer 1

Answer:

what is a refractive index?

●the ratio of the velocity of light in a vacuum to its velocity in a specified medium.

Answer 2

Namaste kpopper !!

Answer:

ans. 1

The ratio of the speed of light in different mediums is called refractive index or coefficient of refraction. It is a unit-less quantity and its constant or do not have any dimension.

The symbol of refraction coefficient is μ ( mu ) .

It is calculated by the formula :

μ = v₁ / v₂ [ velocity₁ / velocity₂ ]

or velocity in first medium / velocity in second medium.

μ = sin i₁ / sin r₁

Ans. 2

initial Distance between the pencil and mirror = 5 m.

Distance between the pencil and its image = ( 5 )2 = 10 m.

When the pencil is moved away from the mirror :

Distance between the pencil and mirror = 5 + 2 = 7 m

Distance between the pencil and its image = ( 7 )2 = 14 m

So, the distance between the image and the pencil is 14 m after moving it 2 m away.

Explanation: