2.A real image formed by a convex mirror is 4.5times the size of the object.If the mirror is 20cm from the object, its focal length is ----------

Q. A real image formed by a concave mirror is 4.5 times the size of the object. If the mirror is 20 cm from the object, its focal length is :

Q. Assertion: Focal length of a convex mirror is $20\text{cm}$. If a real object is placed at a distance of $20\text{cm}$ from the mirror, its virtual, erect and diminished image will be formed.
Reason: If a virtual object is placed at $20\text{cm}$ distance behind the convex mirror, its image is formed at infinity.
Choose the correct option based on it.

Q. The distance between a real object and its image in a convex mirror of focal length $12\text{cm}$ is $32\text{cm}$. Find the size of image if the object size is $1\text{cm}$.

Q. The image formed by convex mirror of focal length $30cm$ is a quarter of the size of the object. Then the distance of the object from the mirror is:

Q. A 2 cm high object is placed at a distance of 20 cm from a concave mirror. A real image is formed 40 cm from the mirror. Calculate the focal length of the mirror and the size of the image.
(3 Marks)