Question

Which of the following is wrong regarding image formation by convex mirror:
A) The image lies between the pole and focus.
B) The image is diminished in size.
C) The image is erect.
D) The image is real.

Answer 1

Hint: A convex mirror has surface bulge towards the outer surface and reflects lights off towards the viewer. A virtual mirror always gives a smaller, virtual , erect image of the object. The image in a virtual mirror is formed between the pole and focus.

Complete step by step solution:
A convex mirror is also called a diverging mirror as the incident light falls on the surface and it Diverges back in all directions. Due to the divergence of the incident rays the image formed is behind the mirror and is not real and they are smaller in size as compared to the object size.The type of image formed as reference to the placement of the object in a convex mirror is given by the below table.

SL.no	Position of the object	Position of the image	Size of image	Nature of image
1	At Infinity	At the focus F, behind the mirror	Highly diminished	Virtual and Erect
2	Between Infinity and the Pole	Between P and F, behind the mirror	Diminished	Virtual and Erect

From the above diagram it is evident that an object kept at infinity or between pole and infinity from a convex mirror always forms :
i) Virtual image
ii) Straight image
iii) Diminish image
iv) Forms between focal and pole.

Therefore the correct answer for the given question is option (D) as a convex mirror never forms a real image and hence it is the incorrect answer regarding convex mirrors.

Note: A convex mirror forms an erect image but smaller in size and they are used as rear view mirrors in cars and two wheelers. They are also used as street light reflectors too since they form virtual images. They are also used in magnifying glass and telescope.