Consider the following properties of virtual images :
$(A)$ Cannot be projected on the screen.
$(B)$ Are formed by both concave and convex lenses.
$(C)$ Are always erect.
$(D)$ Are always inverted.
The correct properties are :

No matter how far you stand from a mirror,your image appears erect. The mirror is likely to be

$(a)$ To construct a ray diagram, we use two rays chosen such that their directions after reflection from the mirror are easily determined. List two such rays and state the path of these rays after reflection for a concave mirror. Use these two rays to draw a ray diagram to locate the image of an object placed between the pole and the focus of a concave mirror.
$(b)$ $A$ concave mirror produces a three-times magnified image on a screen. If the object is placed $20 \text{ cm}$ in front of the mirror, how far is the screen from the object?

$(a)$ Define the optical centre of a spherical lens.
$(b)$ You are given a convex lens of focal length $30 \, cm$. Where would you place an object to get a real,inverted,and highly enlarged image of the object? Draw a ray diagram showing the image formation.
$(c)$ $A$ concave lens has a focal length of $20 \, cm$. At what distance from the lens should an object be placed so that it forms an image at $15 \, cm$ away from the lens?

$(i)$ Describe an activity to find the approximate value of the focal length of a concave mirror.
$(ii)$ What happens to the size of the image of an object when it is moved gradually away from a convex mirror?
$(iii)$ In an experiment to study refraction through a glass slab,it is observed that a ray of light undergoing refraction emerges parallel to the direction of the incident ray. Why does it happen so? Explain with the help of a diagram.

The images show the ray diagrams of images formed by convex mirrors. $P$ is the pole of the mirror. $C$ is the centre of curvature. $F$ is the focus. $AB$ is the object and $A'B'$ is the image.
$5$. Which statements are supported by the two diagrams? Circle 'Yes' or 'No' for each statement.

Is the statement supported by the two diagrams?	Yes/No
Convex mirrors produce virtual images	Yes/No
Convex mirrors produce erect images	Yes/No
Convex mirrors have their focus behind the mirrors	Yes/No

$6$. Which of these is a convex mirror?
$A$. Shaving mirror
$B$. Dentist’s mirror
$C$. Headlight mirror of a bike
$D$. Rear-view mirror of a car
$7$. A mirror magnifies the image of an object by $-1.5$ times. Which of the following is true about the image produced by the mirror?
$A$. The image is real and larger than the object.
$B$. The image is real and smaller than the object.
$C$. The image is virtual and larger than the object.
$D$. The image is virtual and smaller than the object.