An opaque object is placed in front of a spotlight. which does not occur?
a. absorption
b. illumination
c. reflection
d. transmission

The correct answer is ) B  Illumination does not occur when an opaque object is placed in front of a spotlight.                                

Explanation:

   

The following things could happen when a light wave with a single frequency strikes an object.

Absorption can take place. When absorption of light happens, light is converted to heat. Reflection may take place. When this happens the light bounces off the surface of the object and is thus transmitted by the object. It is more common to have visible light of many frequencies or even all frequencies fall towards the surface of objects. When this happens, objects have a propensity to partially absorb, reflect or transmit light certain frequencies. That is, one object might reflect blue light while absorbing all other frequencies of light visible to the naked eyes.

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Acetic acid  /əˈsiːtɪk/, systematically named  ethanoic acid  /ˌɛθəˈnoʊɪk/, is a colourless liquid  organic compound  with the  chemical formula  ch3cooh (also written as ch3co2h or c2h4o2). when undiluted, it is sometimes called  glacial acetic acid.  vinegar  is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water. acetic acid has a distinctive sour taste and pungent smell. in addition to household vinegar, it is mainly produced as a precursor to  polyvinyl acetate  and  cellulose acetate. it is classified as a  weak acid  since it only partially  dissociates  in solution, but concentrated acetic acid is corrosive and can attack the skin.acetic acidnamespreferred iupac nameacetic acidsystematic iupac nameethanoic acidother namesvinegar (when dilute); hydrogen acetate; methanecarboxylic acid[1][2]identifierscas number64-19-7  3d model (jsmol)interactive image3dmetb00009 reference506007chebichebi: 15366  chemblchembl539  chemspider171  drugbankdb03166  echa infocard100.000.528ec number200-580-7e numbere260  (preservatives)gmelin reference1380iuphar/bps1058keggd00010  meshacetic+acidpubchem  cid176rtecs numberaf1225000uniiq40q9n063p  un number2789inchiinchi=1s/c2h4o2/c1-2(3)4/h1h3,(h,3,4)  key:   qtbsbxvteameqo-uhfffaoysa-n  smilescc(o)=o