An Object Faces a Spherical Refracting Surface

question 77

Multiple Choice

An object faces a spherical refracting surface.If r is negative,

• A)the surface is convex.
• B)the surface is concave.
• C)the image must be real.
• D)the object distance must be negative.
• E)this cannot happen; r must be positive.

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Definitions:

Gram-variable

Refers to bacteria that do not consistently stain either Gram-positive or Gram-negative due to certain conditions or characteristics of the cell wall.

Anthrax

A serious infectious disease caused by the bacterium Bacillus anthracis, affecting both humans and animals, and can be transmitted through contact with infected animals or animal products.

Gram-positive

Refers to bacteria that retain the crystal violet dye used in the Gram stain process, indicating a thicker peptidoglycan layer in the cell wall.