Question

Choose the correct option which is true about a bi-concave lens :

• A. Its focal length is positive
• B. It cannot form real images
• C. It cannot form virtual images
• D. It can magnify objects
• E. None of the above

Answer 1

Answer: (B)

It cannot form real images

A bi-concave lens diverges the light rays after refraction so it is not possible for the rays to meet on other side of lens after refraction because of that we can't obtain the image on other side , it means the image will seem to be formed on the same side of lens ,because light rays seem to be coming out of here ,which cannot be taken on a screen therefore it cannot form a real image.

As seen in diagram it don't form magnified image and it's focal length is negative.