Ray Optics and ...

The image formed by a convex mirror is only one-third of the size of the object. If the focal length of the mirror is $$12 \,cm,$$ the image formed will be

When a ray of light from air enters a denser medium, it:

A ray of light moving from an optically rarer to a denser medium 

A $$10 \mathrm{mm}$$ long awl pin is placed vertically in front of a concave mirror. A $$5 \mathrm{mm}$$ long image of the awl pin is formed at $$30 \mathrm{cm}$$ in front of the mirror. The focal length of this mirror is:

A ray of light incident on a lens parallel to its principal axis, after refraction passes through or appears to come from :

A thin convex lens of focal length $$10\ cm$$ is placed in contact with a concave lens of same material and of same focal length. he focal length of combination will be

An object is placed at a distance of $$20 \ cm$$ from a convex lens of focal length $$10\ cm$$. The image is formed on the other side of the lens at a distance

A convex lens makes a real image $$4\ cm$$ long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is $$16\ cm$$ tall. The length of the object must be

The refractive indices of glass and water w.r.t air are $$\dfrac{3}{2}$$ and $$\dfrac{4}{3}$$ respectively. The refractive index of glass w.r.t water will be

A beam of light is converging towards a point $$I$$ on a screen. A plane glass plate whose thickness in the direction of the beam $$=t$$ refractive index $$=\mu$$ is introduced in the path of the beam. The convergence point is shifted by