Question

For a concave lens, if the magnification has a plus sign, then image is _________ .

• A. real and erect
• B. real and inverted
• C. virtual and erect
• D. virtual and inverted

Answer 1

The correct option is C virtual and erect

Magnification is given by. $m=\frac{v}{u}$, we know that u is always negative for a concave lens. Given that m is positive then v is negative. According to sign convention, v is negative when the image falls to the left of the optical centre. To the left of the optical centre, we get virtual and erect images.