15. If the image formed by a lens for all positions of the object placed in front of it is always
virtual, erect and diminished. State the type of the lens, draw a diagram in support of your
answer. If the numerical value of focal length of such a lens is 20 cm, find its power in new
cartesian sign convention.
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If the image formed by a lens for all positions of the object placed in front of it is always virtual, erect and diminished, state the types of lens. Draw a ray diagram in support of your answer, if the numerical value of focal length of such a lens is 20 cm. Find its power in new cartesian of convention.
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This might help you
Explanation:
Concave lens
P= 1/f
= 1/0.2m = -5D( Since it is a concave lens)
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