Ray Optics Test...

A laser beam is used for locating distant objects because it

The light gathering power of a camera lens depends on

To get three images of a single object, one should have two plain mirrors at an angle of:

A ray falls on a prism ABC (AB = BC) and travels as shown in figure. The least value of refractive index of material of the prism, should be:

For the given lens, which of the following statements is true for rays coming from infinity?

An air bubble is contained inside water. It will behave as a:

The refractive index of the material of a prism is and its refracting angle is 30⁰. From one of the refracting surfaces of the prism, an inwards mirror is made. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface, if its angle of incidence on the prism is:

The principal section of a glass prism is an isosceles triangle ABC with AB = AC. One face AC of the glass prism is silvered as shown in the figure. If a ray is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to it, what is the measure of angle BAC?

In Ramsden eyepiece, the focal length of each lens is F. The distance of the image formed by the objective lens from the eye lens is

One of the refracting surfaces of a prism of refractive indexis silvered. The angle of the prism is equal to critical angle of a medium of refractive index 2. A ray of light incident on the unsilvered surface passes through the prism and retraces its path after reflection at the silvered face. Then, the angle of incidence on the unsilvered surface is

Total internal reflection takes place

Width of the central maxima of the diffraction varies

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringe on either side of the central bright fringe is:

In Young's double slit experiment, the fringe width is β, the entire arrangement is placed in a liquid of refractive index n, the fringe width becomes:

A source is at some distance from an obstacle. The distance between the obstacle and the point of observation is 'b' and the wavelength of light is 'λ'. Then, the average distance of n^th Fresnel zone from the point of observation will be _______.

When unpolarised light beam is incident from air onto glass (n = 1.5) at the polarizing angle:

A movie projector,projects an image of length 3.5 m of a 35 mm movie film on a screen.Neglecting absorption of light by the film and the air,the ratio of the illumination on the screen decreases in the ratio

If the pitch of sound from a source appears to drop by 10% to a moving person, then what is the velocity of motion? (Velocity of sound = 330 m/s)

A beam of light of wavelength 600 nm from a distance source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is

When an unpolarized light of intensity I₀ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

Two coherent sources whose intensity ratio is 81 : 1 produce interference fringes. The ratio of minimum to maximum intensity i.e., I_min : I_max is

Two polaroids are placed in the path of unpolarized beam of intensity I₀ such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle θ with the polarization axis of first polaroid, is placed between these polaroids, then the intensity of light emerging from the last polaroid will be :

The dispersive power of a material of lens of focal length 20 cm is 0.08. The longitudinal chromatic aberration of the lens is

When light is incident on a diffraction grating the zero order principal maximum will be