A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is - VgyanHub

Question:

A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is

Options :

(a) -30 cm
(b) 5 cm
(c) -10 cm
(d) 20 cm

Answer :

(a) -30 cm

Answer Steps :

step 1

step 2

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