Where should the object be placed to obtain a real and diminished image using a concave mirror?

What will be the angle of refraction for a light ray incident normally at the surface (in $^{\circ}$)?

Name two spherical mirrors. Define them. Write any three points of difference between them.

Give the relationship of magnification with focal length of a spherical mirror.

$A$ ray is incident along $ACB$ on a spherical mirror,where $C$ is the centre of curvature. In which direction will the ray be reflected?

$A$ $2.0 \text{ cm}$ tall object is placed perpendicular to the principal axis of a convex lens of focal length $10 \text{ cm}$. The distance of the object from the lens is $15 \text{ cm}$. Find the position,nature,and size of the image formed.