Question

Where should an object be placedin front of a convex lensto get a real image ofthe size ofthe object?

a. At the principal focus of the lens

b. At twice the focal length

c. At infinity

d. Between the optical centre of the lens and its principal focus​

Answer 1

Heyaa Mate!

Answer:

b: At twice the focal length

Explanation:

Because if the lens has a focal length of 20 cm, the object must be placed 40cm in front of the lens which will then form an inverted image of the same size as the object, 40 cm behind the lens.

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Answer 2

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B. is correct answer.

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