Light Reflectio...

In a vessel, as shown in fig, point P is just visible when no liquid is filled in vessel through a telescope in the air. When liquid is filled in the vessel completely, point Q is visible without moving the vessel or telescope. Find the refractive index of the liquid.

When light falls on a given plate at angle of incidence of $$60^o$$, the reflected and refracted rays are found to be normal to each other. The refractive index of the material of the plate is then

Which of the following correctly represents the graphical variation between very small angles of incidence (i) and refraction (r) ?

A real object is placed at a distance $$\dfrac{f}{2}$$ in front of a concave mirror having focal length $$f$$. If object is shifted by a distance $$\dfrac{f}{4}$$ away from the mirror. Find the ratio of final magnification to initial magnification.

When a light ray moves from air to a transparent medium the angle of incidence and the angle of refraction are $$45^{\circ}$$ and $$30^{\circ}$$ respectively. Find the refractive index of this medium is

The image of an object placed on the principal axis of a concave mirror of focal length $$12\ cm$$ is formed at a point which is $$10\ cm$$ more distant from the mirror than the object. The magnification of the image is

The refractive indices of substances P,Q, Rand S are 1.38, 1.46, 1.56 and 1.24 respectively. When light travelling in air is incident on these substances at equal angles, the angle of refraction will be maximum in

In the figure below, PQRS denotes the path followed by a ray of light as it travels three media in succession. The absolute refractive indices of the media are $$\mu_1 \, \mu_2\, and\, \mu_3 $$ respectively. (The line segment RS' in the figure is parallel to PQ). Then :

An object is placed at a distance of 20 cm from a convex mirror or radius of curvature 40 cm. At what distance from the object should a plane mirror be placed so that the images due to the mirror and the plane mirror are in the same plane?

An object is placed on the principal axis of a concave mirror at a distance of $$60\ cm$$. If the focal length of the concave mirror is $$40\ cm$$ then determine the magnification of the obtained image.