Focal length of concave lens is_______

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asked Jun 11, 2022 in 10th science by varun (6.7k points)

Focal length of concave lens is_______(negative/positive)

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Focal length of converging lens is_______
An object 2 cm tall is placed on the axis of a convex lens of focal length 5 cm at a distance of 10 cm from the optical centre of the lens.
An object 5 cm high is held 25 cm away from a converging lens of focal length 10 cm.
A convex lens of focal length 10 cm is placed at a distance of 12 cm from a wall.
A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is a concave lens of focal length