Recently Active Optics Questions

a ray of light is incident on concave mirror . it is parallel to principal axis and its height from principal axis is equal to focal length of mirror. the ratio of distance of point B to distance of the focus from centre of c ...

A thin convex lens whose focal length in air is known to be 30cm is cut into two parts by a transverse plane parallel to principal axis and 0.5cm above the principal axis. They are placed on the x-axis a shown in the figure.A ...

Light of wavelength 4000 Ao is incident at small angle on a prism of apex angle 4o The prism has nv = 1.5 & nr = 1.48. The angle of dispersion produced by the prism in this light is ? A)0.2o B) 0.08o C)0.192o D)None of these ...

The fig. shows a silvered lens . ref. index of a = 1.6 and ref. index of b= 1.2 , R1 = 80 cm , R2 = 40 cm and R3 = 20 cm. An object is placed at a distance of 12 cm frm this lens. Find the image posn. http://img835.imageshack ...

A mark placed on the surface of a glass sphere is viewed through a glass prism form an oppositely directed position. If the diameter of the glass sphere is 20 cm, find the position of image if refractive index of glass is 1.5 ...

2 mirrors are inclined at an angle θ as shown in figure.Light ray is incident parallel to one mirror.The ray will start retracing its path after the third collision if: a)θ=45° b)θ=30° c)θ=60° d)all three *Image* ...

*Image* ...

*Image* ...

*Image* ...

*Image* ...

*Image* ...

*Image* ...

*Image* ...

*Image* A solid iron sphere of radius=1m is just submerged in a water tank. A point source of light is kept vertically above its center at a distance 1m from the water surface. Find the area of the sphere's shadow. Refractive ...

*Image* ...

*Image* ...

*Image* ...

*Image* ...

*Image* ...

*Image* ...

Two thin convex lenses of focal lengths f1 and f2 are separated by a horizontal distance 'd' ( where f1 and f2 are greater than 'd') and their centres are displaced by a vertical separation 'δ'...Taking the origin of co-ordi ...

A point source 'S' is placed at a height 'h' from the bottom of a vessel of height 'H'(where h is greater than H)..The vessel is polished at the base ..Water is gradually filled in the vessel at a constant rate of α m3/s. Th ...

Consider a usual set-up of Young's Double Slit Experiment with slits of equal intensity. Take 'O' as origin and Y-axis as the screen..If the average intensity between y1 = -(λ.D)/(4d) and y2 = +(λ.D)/(4d) equals 'n' times t ...

A thin slice is cut out of glass cylinder along a plane parallel to its axis ..The slice is placed on a flat plate (just as a bowl is placed on a table)..the observed interference fringes from this combination shall be??????? ...

*Image* ...

When a newton's disc is rotated at a very high speed , why do the colours mix up and finally appear white??? ...

(1)Why is sunlight yellow? (2)why does sky appear blue?by combining voilet,blue and indigo,we are supposed to get a darker blue,ryt???? ...

Two thin similar convex glass pieces are joined together front to front,with its rear portion silvered such that a sharp image is formed 0.2 m for an object at infinity.When the air between the glass pieces is replaced by wat ...

Consider a cylindrical vessel of height 'H'. A light source is placed at the center of the base. The area illuminated on the ceiling above the container is 'A'. Now a liquid is half filled in the cylinder. if the new area of ...

When light enters water its amplitude changes. Why? ...