1.

An object is kept at 60 cmin front of a convex lenssits realimage is formed at 20cm fromthe lense find the focal length ofthe lense. ?​

Answer»

Explanation:

Its real and inverted image is formed AG a distance of 20cm from the lens. FIND the focal length of the lens.

u=-60v=201/f=1/v-1/u =1/20+1/60 =3+1 /60 =4/60 f=15 cm



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