Ray Optics and ...

The radius of the sphere of which the reflecting surface of a spherical mirror forms a part, is called ...............

A ray of light passes through four transparent media with refractive indices$$\mu_1, \mu_2, \mu_3$$ and $$\mu_4$$ as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have:

A glass slab of thickness 18 cm and refractive index $$\dfrac{3}{2}$$ is placed on a printed matter. The normal shift of the printed matter is

The process of re-emission of absorbed light in all directions with different intensities by the atom or molecule is called ____________.

A rectangular block is composed of three different glass prisms (with refractive indices $$\mu_1, \mu_2$$ and $$\mu_3$$) as shown in the figure below. A ray of light incident to the left face emerges normal to the right face. Then the refractive indices are related as:

A vessel is filled with oil as shown in the diagram. A ray of light from point $$O$$ at the bottom of vessel is incident on the oil - air interface at point $$P$$ and grazes the surface along $$PQ$$. The refractive index of the oil is close to-

Two glass prisms $$P_1$$ and $$P_2$$ are to be combined together to produce dispersion without deviation. The angles of the prisms $$P_1$$ and $$P_2$$ are selected as $$4^o$$ and $$3^o$$ respectively. If the refractive index of prism $$P_1$$ is 1.54, then that of $$P_2$$ will be

Figure shows an irregular block of material of refractive index $$\sqrt { 2 }$$. A ray of light strikes the face $$AB$$ as shown in figure. After refraction, it is incident on a spherical surface $$CD$$ of radius of curvature $$0.4 m$$ and enters a medium of refractive index $$1.514$$ to meet $$PQ$$ at $$E$$. Find the distance $$OE$$ upto two places of decimal :

A ray of light passes through four transparent media with refractive index $${n}_{1}, {n}_{2}, {n}_{3}$$ and $${n}_{4}$$ as shown. The surfaces of all media are parallel.
If the emergent ray $$DE$$ is parallel to the incident ray $$AB$$, then:

A man is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is $$ 1.39 \times 10^9 m$$ and its mean distance from the earth is $$1.5 \times 10^{11} \ m$$, the diameter of the sun's image on the paper is