Physics Wave Optics

In Young double slit experiment the n^th red bright band coincide with (n + 1)^th blue bright band. If the wavelength of red and blue light are 7500 Å and 5000 Å, then the value of 'n' is

Activity of radioactive element decrease to one-fourth of original activity R₀ in 16 years, after further 16 years, its activity will be  

Figure shows a mixture of blue, green and red coloured rays incident normally on a right angled prism. The critical angles of the material of the prism for red, green and blue are 46º, 44º and 43º respectively. The arrangement will separate

The fringe width in Young's double slit experiment increases when

If two coherent waves are represented by y₁ = 4sinωt and y₂= 3sin(ωt+π/3)interfere at a point, the amplitude of resulting wave will be about

The height at which the weight of an object becomes (1/16)^thof its weight on the surface of earth is (R is radius of earth)

A body is released from height equal to radius R of the earth. The velocity of body with which it will strike the earth surface is

Unpolarised light incident on transparent glass at incident angle 60°. If reflected ray is completely polarised, then angle of refraction is

If a star emitting light of wavelength 500 nm is moving towards earth with a velocity of 1.5 ´ 106 m/s then the shift in the wavelength due to doppler's effect will be:

An objective lens of a telescope has diameter 200 cm. The limit of resolution of telescope for wavelength 600 nm is nearly