If two mirrors are placed side-by-side on a wall and one is placed on the ceiling,how many images will be formed?

An object is placed in front of a convex mirror at a distance of $50\, cm$. $A$ plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and the plane mirror is $30\, cm$,it is found that there is no parallax between the images formed by the two mirrors. The magnification of the convex mirror will be......

Which of the following phenomena are involved in the formation of a rainbow?

Amount of light entering into the camera depends upon

For a concave mirror, if a virtual image is formed, the graph between $m$ and $u$ is of the form:

$A$ ray of sunlight enters a spherical water droplet $(n = 4/3)$ at an angle of incidence $53^o$ measured with respect to the normal to the surface. It is reflected from the back surface of the droplet and re-enters into air. The angle between the incoming and outgoing ray is $.......^o$ [Take $\sin \,53^o = 0.8$]