When seen in green light, the saffron and green portions of our national flag will appear to be :

When a light ray enters refracting medium, it is found that the magnitude of the angle of refraction is equal to half the angle of reflection. If n is the refractive index of the medium, then the angle of incidence is :

Light travels through a glass plate of thickness t and having refractive index μ, If c be the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is :

A ray of light is incident on the surface of separation of a medium at an angle 45° and is refracted in the medium at an angle 30°, What will be the velocity of light in the medium ?

A ray of light passes through four transparent media with refractive indices μ1, μ2, μ3 and μ4 as shown in the given figure.
The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have :

If the lower half of a concave mirror’s reflecting surface is made opaque, which of the following statements describe the image of an object placed in-front of the mirror

S1 : Intensity of the image will increase.
S2 : The image will show only half of the object.
S3 : No change in the image.
S4 : Intensity of the image will be reduced to half.

Match the corresponding entries of column-1 with coloumn-2 (Where m is the magnification produced by the mirror) :

How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container
(given that \[_{\alpha}\mu_{\omega} =4/3\])

A rectangular tank of depth 8 meter is full of water (μ = 4/3), the bottom is seen at the depth

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 = μ, is introduced in the path of the beam. The convergence point is shifted by