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8 votes
1 answer
2k views

Is there a name for the number of '9's in numbers such as 0.999 (where it would be 3)?

I am doing an optics simulation involving transmission and reflection coefficients very close to 1, such as 0.999. While I was an undergraduate student, a professor mentioned that, in certain fields, ...
jcuk's user avatar
  • 93
0 votes
1 answer
22 views

Adjectives regarding interfaces

I'm studying X-Ray reflectivity at interfaces and the book I'm reading reads: ... The ideally flat, but graded interface, and the ideally sharp, but roughened interface, will be considered... I'm ...
chemdamned's user avatar
2 votes
2 answers
2k views

What is the difference between reflectivity and reflectance?

This question is in the context of solar reflections in buildings that cause glare. The two terms are similar but they have differences.
Camilo Diaz's user avatar
0 votes
3 answers
119 views

Is lens a type of mirror?

I saw the definition of 'lens' in an online portal as Lens is a type of mirror which refracts the light instead of reflection Is that true to say 'type of mirror'? Mirrors have an opaque surface in ...
Adarsh P S's user avatar
0 votes
4 answers
148 views

Source of light [closed]

Is this statement true" Chair is a source of light". We know that there are two types of source of light(1) Primary source of light ( like bulb, candle) (2) secondary source of light ( like ...
The Explorer's user avatar
2 votes
2 answers
680 views

What is a "Gaussian mirror"?

What is a Gaussian mirror? I have seen the term used in a book. Gaussian mirrors are supposed to be free of spherical aberration. But what are they?
thedude's user avatar
  • 628
4 votes
2 answers
32k views

What are virtual objects, Reflection of light? [duplicate]

While studying reflection through a plane mirror, I have been told that when the object is real the image will be virtual and the image will be real while the object is virtual. What are virtual ...
Abhishek Verma's user avatar