An object 60cm from a lens gives a virtual image at a distance of 20cm in front of the lens. What is the focal length of the lens? Is the lens converging or diverging? Give reasons for your answer.
Add an Answer
More Questions From This User See All
Answers & Comments
Answer:
1/focal length = 1/image distance + 1/object distance
focal length positive means convex
negative means concave
do it yourself , only then will you improve
Answer:
Given:
Object distance, u = - 60 cm
Image distance, v = - 20 cm
Using lens formula,
1/v−1/u=1/f
⇒1/f=1/−20 −1/−60= −1/30cm
⇒f=−30 cm
Since, the focal length is negative, the lens is a diverging lens or a concave lens.
I hope I helped you mark my answer brainllest.