The frequency,wavelength,or speed of light does not change on reflection.

$A$ $2.0 \text{ cm}$ 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.

$A$ convex mirror used on an automobile has $3\, m$ radius of curvature. If a bus is located at $5\, m$ from this mirror,find the position,nature,and size of the image.

Through which point of a convex lens does a ray of light pass without undergoing refraction?

The image formed by a convex spherical mirror is always:

$A$ plane mirror as well as a convex mirror can produce a real image if the object is virtual. How?