Chapter 1: Light - Reflection and Refraction

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Q
Light - Reflection and Reflection

Question:

Where should an object be placed in front of a convex lens 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 its principal focus.

Answer:

The correct option is (b).

(b) At twice the focal length.

Twice the focal length is equal to the radius of curvature. That is object should be placed at the centre of curvature to obtain the real image of the same size of the object.


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