Question

The focal length of a thin lens is given by f = -10cm. Is the lens concave or convex?

Answer 1

focal lenth

$= - 10$

power of the lens

$d = \frac{1}{f}$

$d = \frac{1}{ - 10}$

$d = - 0.1dioptre$

$\large{itisconcavelens}$

$\large{cozitspowerisnegative}$

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$\large{vergilneedstobeDie}$