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.

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.

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?

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.

The light of wavelength 6,000 overset @A falls normally on a slit odf width 2 mm.Calculate the linear width of central mximum on a screen kept 4 m away from teh slit.

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.

A telescope has an objective lens of 10 cm diameter and is situated at a distance of 1 km from two objects.The can be resolved by the telescope, when the mean wavelength of light is 5,000 overset @A ,is of the order of

A rectangular glass block of thickness 10 cm and refractive index 1.5 is placed over a small coin.A beaker is filled with water of refractive index 4//3 to a height of 10 cm and is placed over a small block. If the eye is slowly moved away from the normal at a certain position,the coin is found to diappear due to total internal reflection.At what surface does it happen and why? .