Ansel Places an Object 30 Cm from a Thin,convex Lens

question 28

Multiple Choice

Ansel places an object 30 cm from a thin,convex lens along the axis.If a real image forms at a distance of 15 cm from the lens,what is the focal length of the lens?

• A) 15 cm
• B) 10 cm
• C) 7.5 cm
• D) 30 cm

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