Ray Optics

In given lens combination, each lens is of focal length 10 cm .

Correct ray diagram for this combination is

The frequency of a light wave in a material is $2 \times 10^{14} \mathrm{~Hz}$ and wavelength is $5000 \mathop {\rm{A}}\limits^{\rm{o}} $. The refractive index of material will be

The magnifying power of a telescope is 9 . When it is adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm . The ratio of focal length of objective lens to focal length of eyepiece is found to be $ m $, then ...

Power of biconvex lens is $ P $ diopter. When it is cut into two symmetrical halves by a plane containing the principal axis. The ratio of power of two halves is

A thin plano-convex lens of focal length \(f\) is split into two halves one of the halves is shifted along the optical axis. The separation between object and image formed by one of the half-lenses is 2.4 and the magnification of same lens ...

A vessel is half filled with a liquid of refractive index \(\mu\). The other half of the vessel is filled with an immiscible liquid of refractive index \(2 \mu\). The apparent depth of the vessel is \(50 \%\) of the actual depth. Then $$\mu...

An achromatic convergent doublet of two lenses in contact has a power of +5 D. The power of converging lens is +6 D. The ratio of the dispersive power of the convergent and divergent lenses is

A mosquito O is sitting infront of a glass rod having spherical end of radius of curvature 40 cm. The image would be formed at

Two plane mirrors A and B are aligned parallel to each other as shown in the figure.

A ray of light is incident at an angle 30\(^\circ\) at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. Th...

The property of light used in optical fibre cables is

A spherical lens of power \(-\)4D is placed at a distance of 15 cm from another spherical lens of power 5 D. A beam of parallel light falls on the first spherical lens. The final image formed is

A thin equi-convex lens is made of glass of refractive index 1.5 and its focal length is 0.2 m. If it acts as a concave lens of focal length 0.5 cm when dipped in a liquid, the refractive index of the liquid is