always positive always negative zero Concave Mirror: A concave mirror is a converging mirror. Dependent on the location of an object in front of the concave mirror, the image can be real or imaginary. If the object is closer to the mirror than the focal length, the image is imagi...
The magnification (Hi/Ho) produced by a concave lens is always: a. (Hi/Ho)=1 b (Hi/Ho) is greater than 1 c. (Hi/Ho) is less than 1 d. (Hi/Ho)=infinity Determine whether the following value should be negative or positive. The focal length, f, of a convex mirror....
REAL image is ALWAYS inverted. VIRTUAL image is ALWAYS upright. Convex mirror and diversing lens ALWAYS make negative, virtual, upright image. Is concave lens positive or negative? A concave lens is a diverging lens, so it will always have a negative focal length. Therefore, the power of a...
According to the sign convention, distances in front of the mirror are positive, and distances behind the mirror are negative. Therefore, the closer position is at 18 cm in front of the mirror (positive do), and the farther position is at 72 cm behind the mirror (negative do). In ...
Equation (1) is valid only when applied to paraxial rays. The shape of a lens may differ given the same material and lens power. Figure 2 shows several ienses with the same optical power and different forms. The first three lenses are positive; the last three are negative. A lens is ...
is positive at a critical point, then the function has a local minimum at that point. If the second derivative is negative, then the function has a local maximum. If the second derivative is zero, then the second derivative test is inconclusive, and other methods must be used to determine...
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different forms. The first three lenses are positive; the last three are negative. A lens is called thin if its thicknessdis small in comparison to r1and r2. A sufficiently accurate expression of the optical power of such a lens is obtained when the second term in equation (1) is ...
The second derivative test can be used to determine the concavity of a function. If the second derivative is negative, the function is concave, if it is positive, the function is convex, and if it is zero, the concavity cannot be determined. ...
The focal length f is positive for converging lenses. True False Answer true or false: The focal distance of a concave mirror is positive. The focal length f is negative for diverging lenses. True False Choose true or false for the following statement regarding the sign conventions for mirro...