Question

A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black
$\left(i\right)$ The image will be shifted downward
$\left(ii\right)$ The image will be shifted upward
$\left(iii\right)$ The image will not be shifted
$\left(iv\right)$ The intensity of the image will decrease

• A. $\left(i\right)$ and $\left(ii\right)$
• B. $\left(ii\right)$ and $\left(iii\right)$
• C. $\left(iii\right)$ and $\left(iv\right)$
• D. Only $\left(iv\right)$

Answer 1

The correct option is C $\left(iii\right)$ and $\left(iv\right)$

When a part of lens in covered then there will be no shift in the image but the intensity of image decreases due to less oumber of light rays forming the image.