Question

an object is placed at a distance of 30 cm from the lens its image is formed at a distance of 10 cm on the same side of the lens find the focal length of the lens used​

Answer 1

Answer:

If an object is placed at a distance of 30 cm in front of the convex lens the image is formed at a distance of 10 cm, what is the focal length of the lens?

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Since the object distance of a convex lens is opposite to the incident ray

U= -30

Image distance(V)= 10

According to lens formula

(1/v)-(1/u)=1/f

(1/10)-(1/-30)=(1/f)

Taking L.C.M

(3+1)/30=1/f

Reciprocating the equation

f=30/(4)

f=7.5

Explanation:

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Answer 2

Answer:

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