Light Reflectio...

Gita arranges some mirrors in group- $$1$$ and group- $$2$$ according to the magnification, type of image and size of image from the following data.

In a car a rear view mirror having a radius of curvature 1.50 m forms a virtual image of a bus located 10.0 m from the mirror. The factor by which the mirror magnifies the size of the bus is close to

From the understanding of cartesian sign convention for reflection by spherical mirror, students took part in group discussion for $$FA-I$$ in classroom. Who is wrong in the group discussion?
Alpesh : All the distances are measured from the pole of a mirror parallel to the principal axis.
Beena: The distance measured in the direction of incident ray are taken positive.
Champak: The height measured upward and perpendicular to principal axis is taken negative.
Daksha : The height measured downward and perpendicular to principal axis is taken as positive.

The magnification produced by a mirror is $$+\dfrac{1}{3}.$$ Then the mirror is a ____________.

Choose the correct answer from the alternatives given.
There is certain material developed in laboratories which have a negative refractive index. A ray incident from the air (medium 1) into such a medium (medium 2) shall follow a path given by:

The image of the needle placed 45 cm from a lens is formed on a screen placed 90 cm on the other side of the lens. The displacement of the image, if the needle is moved by 5.0 cm away from the lens is 

A convex mirror forms an image one-fourth the size of the object. If object is at a distance of $$0.5\ m$$ from mirror the focal length of the mirror is

A convex mirror of focal length $$f$$ forms an image which is $$\cfrac { 1 }{ n } $$ times the object. The distance of the object from the mirror is :

Magnification produced is +$$\dfrac { 1 }{ 3 }$$, then what kind of mirror it is?

A ray $$R_{1}$$ is incident on the plane surface of the glass slab (kept in air) of refractive index $$\sqrt {2}$$ at an angle of incidence equal to the critical angle for this air glass system. The refracted ray $$R_{2}$$ undergoes partial reflection and refraction at the other surface. The angle between reflected ray $$R_{3}$$ and the refracted ray $$R_{4}$$ at that surface is :