Optics

When light rays undergoes two internal reflections inside a raindrop, which of the rainbow is formed?

Rays of different colours fail to converge at a point after going through a converging lens. This defect is called

For a total internal reflection, which of the following is correct?

If a parallel beam of light is incident on spherical mirrors then after reflection they pass through focal point. If F is the focal length and R is the radius of curvature of mirror then

When a beam of white light is allowed to pass through convex lens parallel to principle axis, the different colors of light converge at different point on the principle axis after refraction. This is called

Two thin lenses are of same focal lengths (f), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be

Dispersive power depends on the

The separation between the images formed by extreme wavelengths of the visible range is called

The refractive index of glass is 1.5 for light waves of $\lambda=6000\AA$ in vacuum. Its wavelength in glass is

When a light wave travels from water to glass, its

Rainbow is a phenomenon due to

A ray of light is incident of the surface of a glass plate at an angle of incidence equal to Brewster's angle $\Phi$. If $\mu$ denotes the refractive index of glass w.r.t. air, then what will be the angle between reflected and refracted rays?

Focal length of objective and eyepiece of telescope are 200 cm and 4 cm respectively. What is the length of telescope for normal adjustment?

When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index:

Assertion : The frequencies of incident, reflected and refracted beam of monochromatic light incident from one medium to another are same.

Reason : The incident, reflected and refracted rays are coplanar