A conversing beam of rays is incident on a diverging lens. Having passed though 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 meets will move 5 cm closer to the lens. The focal length of the lens is :
Text Solution
Verified by ExpertsThe correct answer is:
C
– 
= 
⇒ u = 10 ⇒ v = 15
f = ? ⇒ 
– 
= 
= 
∴ f = – 
= – 30 cm
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