#### Question

A burning candle whose flame is 1.5 cm tall is placed at a certain distance in front of a convex lens. An image of candle flame is received on a white screen kept behind the lens. The image of flame also measures 1.5 cm. If *f *is the focal length of convex lens, the candle is placed:

(a) at *f*

(*b*) between *f* and 2*f*

(*c*) at 2*f*

(*d*) beyond 2*f*

#### Solution

at 2*f*

This is because a convex lens produces an image of the same size as the object when the object is placed at 2*f**.*

Is there an error in this question or solution?

Solution A Burning Candle Whose Flame is 1.5 Cm Tall is Placed at a Certain Distance in Front of a Convex Lens. an Image of Candle Flame is Received on a White Screen Kept Behind the Lens. the Image of Flame Also Measures 1.5 Cm. If F Is the Focal Length of Convex Lens, the Candle is Placed: (A) At F (B) Between F And 2f (C) at 2f (D) Beyond 2f Concept: Refraction of Light - Image Formation by Lenses - Convex Lens.