White light may be considred to have `lambda` from `4000 overset @A` to `7500 overset @A`.If an oil film has thickness `10^(-4)`cm, deduce the wavelength in the visible region for which the reflection along the normal direction will be
Weak Take`mu` of the oil as 1.4.

White light may be considred to have lambda from 4,000 overset @A to 7,500 overset @A .If an oil film has thickness 10^(-4) cm,deduce the wavelength in the visible refion for which the reflection alog the normal direction will be strong.Take mu of the oil as 1.4.

A thin film is 4,000 overset @A thick. White light from an extended source falls normally on the film.If the refractive index of film is 1.5,what wavelength within the visible spectrum will be intenisifed in the reflected beam ,if visible range of the spectrum is 3,900 overset @A to 7,800 overset @A ?

Light of wavelength 6,000 overset @A is incident on a thin film of refractive index 1.5 ,such that angle of refraction into the film in 60^@ .Calculate the smallest thickness of the film,which will make it appear dark by reflection.

Wavelength of light used in an opticla instrument are lambda_1=4,000 overset@A and lambda_2=5,000 overset @A ,then ratio of their respective resolving powers(corresponding to lambda_1 and lambda_2 ) is:

Monochromatic ligth of wavelgth 6,000 overset @A is used in a Young's double slit experiment.One of the slits is covered by a transparent film of thickness 1.2 xx 10^(-5) m having refractive index 1.4.How many fringes will shift due to the introduction of the film?

In a Young,s double split experiment, light of wavelength 4000 overset@A is incident on a double slit. If the overall separation of 10 fringes on a screen 100 cm away is 0.4 cm. Find the distance between the two slits.

Glass of refractive index 1.5 is coated with a thin layer of thickness t and refractive index 1.8 . Light of wavelength lambda travelling in air is incident normally on the layer. It is partly reflected at the upper and the lower surfaces of the layer and the two reflected rays interface . If lambda = 648 nm , obtain the least value of t ("in" 10^(-8)m ) which the rays interface constructively.

The two slits in Young's double slit experiment are seprated by a distance of 0.03 cm.When light of wavelength 5,000 overset@A falls on the slits,nd interference pattern is produced on the screen 1.5 m away.Find the distance of 4th bright fringe from the central maximum.

A telescope has an objective of diameter of 60 cm. The focal lengths of the objective and eye piece are 2.0 m and 1.0 cm respectively. The telescope is directed to view two distant almost point sources of light (e.g. two stars of a binary). The sources are at roughly the same distance (=10^4 light years) along the line of sight but separated transverse to the line of sight by a distnace of 10^10 m . what will the telescope resolve the two objects i.e. will it see two distinct stars?

The Young's double-slit experiment is done in a medium of refractive index 4//3. A light of 600 nm wavelength is falling on the slits having 0.45 mm separation. The lower shift S_(2) is covered by a thin glass sheet of thickness 10.4 mm and refractive index. 1.5. The interference pattern is observed on a screen placed 1.5 m from the slits as shown in Figure Find the light intensity of point O relative to the maximum fringe intensity.