Question

A lens forms a 3 times magnified virtual image. Then the lens will be....​

Answer 1

Answer:

The correct option is D) -12. Here Magnification "M" = 3 u= -8 cm as u (object distance) is always negative. M = -v/u 3 = -v/-8 3 = v/8 v (position of image)= 24 cm The image is formed in front of the mirror. By using lens mirror formula, focal length can be calculated. For focal length: 1/f = 1/u +1/v 1/f = 1/-8 + 1/24 1/f = 1/24 - 1/8 1/f =1/24 - 3/24 1/f = -2/24 = -1/12 f= -12 cm.

Explanation:

@Dare

Answer 2

Answer:

The correct option is D) -12.

The correct option is D) -12.u= -8 cm as u (object distance) is always negative. The image is formed in front of the mirror. By using lens mirror formula, focal length can be calculated.

Explanation:

@darksoul