Question

Where an object should be placed in front of a concave mirror to get a real image of the size of the 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 principal focus

Answer 1

Answer:

A concave mirror forms a virtual, enlarged and erect image only when object is placed between its principal focus and pole. Thus, in given situation of a concave lens having focal length equal to 15cm, the object must be placed less than 15cm from pole of the mirror to get an erect image.

Explanation:

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Answer 2

Answer:

(b) - at twice the focal length