Question

A concave mirror forms real image of a point source lying on the optical axis at a distance of 50cm from the mirror. The focal length of the mirror is 25cm. The mirror is cut in two, and its halves are drawn at a distance of 1 cm apart in a direction perpendicular to the optical axis.

Q. Two statements are provided. Choose which is true and which is false.
Statement I: Image formed by half cut mirror has just half the intensity as that of the intensity of image formed by complete mirror.
Statement II: More the lateral separation between the two halves of the mirror, less will be the separation between the two images, as show in the given situation.
A. `T,T`
B. `T,F`
C. `F,T`
D. `F,F`

Answer 1

Correct Answer - b.
For half the mirror, due to reflection being half of the incoming ray, so the intensity of the image is obviously half. More the lateral separation, more will be the gap between the two images formed.