A Convex Mirror with Focal Length of -20 Cm Forms

question 81

Multiple Choice

A convex mirror with focal length of -20 cm forms an image 12 cm behind the surface.Where is the object located as measured from the surface?

• A)7.5 cm
• B)15 cm
• C)22 cm
• D)30 cm

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Definitions:

Grade Equivalent

A measure indicating the school grade level of students to whom a test taker's performance is most similar.

Achievement Test

A type of ability test that measures what one has learned. Types of achievement tests include survey battery tests, diagnostic tests, and readiness tests.

Percentiles

A measure that indicates the value below which a given percentage of observations in a group of observations falls.

Stanines

Derived from the term “standard nines,” this is a standardized score frequently used in schools. Often used with achievement tests, stanines have a mean of 5 and a standard deviation of 2, and range from 1 to 9.