Wave Optics Tes...

A parallel beam of light of wavelength 5000 Å is incident normally on a single slit of width 0.001 mm. The light is focussed by a convex lens on a screen placed in focal plane. The first minimum is formed for the angle of diffraction equal to

The position of the direct image obtained at O, when a monochromatic beam of light is passed through a plane transmission grating at normal incidence is shown in Fig. The diffracted images A, B and C correspond to the first, second and third order diffraction when the source is replaced by another source of shorter wave – length

Light of wavelength 5000 Å is incident normally on a slit. The first minimum of the diffraction pattern is formed at a distance of 5 mm from central maximum.The screen is situated at distance of 2 m from the slit. The slit width is

A calcite crystal is placed over a dot on a piece of paper and rotated. On viewing through calcite, one will see

A star is moving away from the earth with a velocity of 100 km/s. if velocity of light is 3 × 10⁸ m/s then the shift of its spectral line of wavelength 5700 Å due to Dopper’s effect will be

Ray optics is valid, when characteristic dimensions are

Wavelength of light of frequency 100 Hz is

In Young’s double slit expt., 12 fringes are obtained to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, umber of the fringes observed in the same segment of the screen is given by

Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π/2 at point A and π at point B. Then the difference between the resultant intensities at A and B is

Angular width (θ) of central maximum of a diffraction pattern of a single slit does not depend upon