Question

WHERE AN OBJECT SHOULD BE PLACED I FRONT OF CONVEX LENS TO GET A REAL IMAGE OF SAME SIZE OF OBJECT? OPTIONS ARE :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 IT'S PRINCIPAL FOCUS.

Answer 1

At twice the focal lenght or 2r

Answer 2

Option b- At twice the focal length. That is at the centre of curvature. The distance between pole and centre of curvature is known as radius of curvature and we have a relation of Radius that is the twice of focal length is equal to the radius.

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