According to the sign conventions, focal length of a concave lens is _____.

positive

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negative

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zero

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Infinity

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According to the "New Cartesian Sign Convention" for mirrors, what sign has been given to the focal length of : (i) a concave mirror ? (ii) a convex mirror ?

According to New Cartesian Sign Convention : (a) focal length of concave mirror is positive and that of convex mirror is negative (b) focal length of both concave and convex mirrors is positive (c) focal length of both concave and convex mirrors is negative (d) focal length of concave mirror is negative and that of convex mirror is positive

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

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(b) A concave lens of focal length 50 cm

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