How should a ray incident on a rectangular slab so that it comes out from the opposite side without being displaced?

How water comes out from the cell ?

Two blocks of mass m_(1)=10kg and m_(2)=5kg connected to each other by a massless inextensible string of length 0.3m are placed along a diameter of the turntable. The coefficient of friction between the table and m_(1) is 0.5 while there is no friction between m_(2) and the table. the table is rotating with an angular velocity of 10rad//s . about a vertical axis passing through its center O . the masses are placed along the diameter of the table on either side of the center O such that the mass m_(1) is at a distance of 0.124m from O . the masses are observed to be at a rest with respect to an observed on the tuntable (g=9.8m//s^(2)) . (a) Calculate the friction on m_(1) (b) What should be the minimum angular speed of the turntable so that the masses will slip from this position? (c ) How should the masses be placed with the string remaining taut so that there is no friction on m_(1) .

At what angle should a ray of light be incident on the face of a prism of refracting angle 60^(@) so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is 1.524.

Light from a luminious point on the lower face of a rectangular glass slab , 2 cm thick, strikes the upper face and the totally reflected rays outline a circle of 3.2 cm radius on the lower face. Find the refractive index of the glass.

A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focussed on a distant object in such a way that parallel rays comes out from the eye lens. If the object subtends an angle 2^(@) at the objective, the angular width of the image

A mixed ray of red and green colour incidents obilquely on surface of rectangular glass slab. After passing through slab, the rays of red and violet colour emerging out surface parallel to incident surface are…..

A rectangular glass slab ABCD of refractive index n_(1) is immerged in water of refractive index n_(2) (n_(1) gt n_(2)) . A ray of light is incident at the surface AB of the slab as shown . The maximum value of the angle of incidence alpha_("max") , such that the ray comes out only from the other surface CD , is given by :-

Two pendulums with identical bobs and lengths are suspended from a common support such that in real position the two bobs are in contact (figure). One of the bobs is released after being displaced by 10^(@) so that it collides elastically head-on with the other bob. (a) Describe the motion of two bobs. (b) Draw a graph showing variation in energy of either pendumlum with time, for 0 le t le 2T , where T is the period of each pendulum.