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Answered on 23/12/2021 Learn Light- Reflection and Refraction

1. What is the magnification of a plane mirror

Devansh Sharma

Professional educationist with experience of 8years+ in academic teaching.

Magnification of the plane mirror is 1 because the size of image formed by it is as same as the size of object placed in front of it.
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Answered on 23/12/2021 Learn Light- Reflection and Refraction

2. What is the radius of curvature of plane mirror?

Devansh Sharma

Professional educationist with experience of 8years+ in academic teaching.

It is infinite.
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Answered on 23/12/2021 Learn Light- Reflection and Refraction

3. Why paper catches fire when a convex lens is used to ficus sunlight?

Devansh Sharma

Professional educationist with experience of 8years+ in academic teaching.

It catches fire because of accumulation of heat energy at a particular spot.
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Answered on 23/12/2021 Learn Light- Reflection and Refraction

4. What is silvering of mirror?

Devansh Sharma

Professional educationist with experience of 8years+ in academic teaching.

It is a chemical process done on a reflecting substance to produce a mirror generally coating is done on a non-condusive substrate example glass.
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Answered on 23/12/2021 Learn Light- Reflection and Refraction

5. What is refractive mirror?

Devansh Sharma

Professional educationist with experience of 8years+ in academic teaching.

It is a mirror which generally bends the incident ray into another medium. example you look at a pencil in a glass of water the submerged part of it appears to be different from its actual place.
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Answered on 15 Apr Learn Light- Reflection and Refraction

7. The refractive index of water is 1.33 and kerosene is 1.44. Calculate refractive index of the kerosene... read more
7. The refractive index of water is 1.33 and kerosene is 1.44. Calculate refractive index of the kerosene with respect to water. read less

Sadika

Refractive index of kerosene with respect to water can be calculated using the formula: Refractive index (kerosene/water)=Refractive index of kerosene/Refractive index of water=1.44/1.33
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Answered on 23/12/2021 Learn Light- Reflection and Refraction

8. What kind of mirrors are used in big shopping stores to watch activities of customers?

Devansh Sharma

Professional educationist with experience of 8years+ in academic teaching.

In general convex mirrors are used in shopping malls to keep an eye on customers because it covers larger field of view.
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Answered on 15 Apr Learn Light- Reflection and Refraction

9. Give mirror image of word "AMBULANCE"

Sadika

Mirror image of the word "AMBULANCE" is "ECNALUBMA".
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Answered on 23/12/2021 Learn Light- Reflection and Refraction

10. The magnification produced by a plane mirror is +1. What does it mean?

Devansh Sharma

Professional educationist with experience of 8years+ in academic teaching.

It means image formed is erect, virtual and of same size as object.
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Lesson Posted on 30/04/2020 Learn Light- Reflection and Refraction +1 CBSE Schools

light reflection introductory part

Suman Jha

I am a teacher having 4+ years of experience in teaching Science and mathematics from 6 to 10 CBSE students...

Light- It is a form of energy which produces the sensation of sight. Properties of light It is an electromagnectic wave. Light travels along a straight path that is rectilinear propogation of light. Speed of light in vacuum is 3×108 m/s A Ray of light Beam of light A ray... read more

Light- It is a form of energy which produces the sensation of sight.

Properties of light

  • It is an electromagnectic wave.
  • Light travels along a straight path that is rectilinear propogation of light.
  • Speed of light in vacuum is 3×108 m/s

 

A Ray of light Beam of light
A ray of light is apath followed by light energy in a transparent medium A group of parallel rays of light emitted by the source of light.

light rays

Three types of beam of light

REFLECTION OF LIGHT

The process of returning back or bouncing back the light to the same medium after striking a surface is called reflection of light.

 

laws of reflection

1. Incident angle (θi) is equal to the reflected angle (θr).

               θi=θr

2. Incident ray, Reflected ray and normal to the reflecting surface at the point of incidence lie in the same plane.

  • Reflection of silver is highest that is approximately 95%
  • reflection of coal is approx. 4%

TYPES OF REFLECTION

 

REGULAR REFLECTION DIFFUESD REFLECTION
when a parallel beam of light falls on a smooth and highly polished surface. when a parallel beam of light falls on a rough surface. 
the reflected beam is parallel  the reflected light is not parallel
reflected light is directed in a fixed direction reflected light spread over wide area 
e.g. search lights , polished shoes ,automobile headlights etc. e.g. light reflected by wooden table ,newspaper etc.

 

 

 

 

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