If you want to see an enlarged image of your face, which type of mirror will you use? Where will you place your face?

An object is placed at a distance of $40\, cm$ in front of a concave mirror of focal length $20\, cm$. The image produced is

What is meant by a lateral shift?

The size of an image of an object formed by a mirror with a focal length of $20\, cm$ is observed to be reduced to $1/3^{rd}$ of its size. At what distance is the object placed from the mirror? What is the nature of the image and the mirror?

If a convex lens forms a real and magnified image of an object,where is the object placed?

$A$ ray of light is incident obliquely on a glass slab. Draw a ray diagram showing the path of the light ray. Clearly,mark the angle of incidence,angle of refraction,angle of emergence,and lateral displacement of the ray. Give a formula to find the refractive index of the glass slab in terms of the angle of incidence and the angle of refraction.