13.If the image formed by a lens for all position of the object placed in front of it is always virtual, Erect and diminished , state the type of the lens. Draw a ray diagram in support of your answer. If the numerical value of focal length of such lens is 20 cm find its power in new cartesian sign convention.
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power is 35 and the focal length remains the same
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answer is power is 35 and the focal length remains the same
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