A single lens is mounted in a tube. A parallel beam enters the tube and emerges out of the tube as a divergent beam. Can you say with certainty that there is a diverging lens in the tube ?

Two thin lenses are placed 5cm apart along the same axis and illuminted with a beam of light parallel to that axis. The first lens in the path of the beam is a converging lens of focal length 10cm whereas the second is a diverging lens of focal length 5cm. If the second lens if now moved toward the first, the emergent light

Water enters into a smooth horizontal tapering tube with a speed 2 m/sec and emerges out of the tube with a speed 8 m/sec . Find the ratio of the radii of cross sections of the tube at these two ends.

A particle of mass 0.1kg is launched at an angle of 53^(@) with the horizontal . The particle enters a fixed rough hollow tube whose length is slightly less than 12.5m and which is inclined at an angle of 37^(@) with the horizontal as shown in figure. It is known that the velocity of ball when it enters the tube is parallel to the axis of the tube. The coefficient of friction betweent the particle and tube inside the tube is mu=(3)/(8)[ Take g=10m//g^(2)] The kinetic energy of the particle when it comes out of the tube is approximately equal to :

A particle of mass 0.1kg is launched at an angle of 53^(@) with the horizontal . The particle enters a fixed rough hollow tube whose length is slightly less than 12.5m and which is inclined at an angle of 37^(@) with the horizontal as shown in figure. It is known that the velocity of ball when it enters the tube is parallel to the axis of the tube. The coefficient of friction betweent the particle and tube inside the tube is mu=(3)/(8)[ Take g=10m//g^(2)] The velocity of the particle as it enters the tube is :

A particle of mass 0.1kg is launched at an angle of 53^(@) with the horizontal . The particle enters a fixed rough hollow tube whose length is slightly less than 12.5m and which is inclined at an angle of 37^(@) with the horizontal as shown in figure. It is known that the velocity of ball when it enters the tube is parallel to the axis of the tube. The coefficient of friction betweent the particle and tube inside the tube is mu=(3)/(8)[ Take g=10m//g^(2)] The distance from the point of projection where the particle will land on the horizontal plane after coming out from the tube is approximately equal to :

A small aperture is illuminated with a parallel beam of lambda= 628 nm . The emergent beam has an angular divergence of 2^0 . The size of the aperture is

In the figure shown a converging lens and a diverging lens of focal lengths 20cm and -5cm respectively are separated by a distance such that a paralel beam of light of intensity 100 watt//m^(2) incident on the converging lens comes out as parallel beam from the diverging lens. Find the intensity of the outgoing beam in watt//m^(2)

A one meter long glas tube is open at both ends. One end of the tube is dipped into a mercury cup, the tube is kept vertical and the air is pumped out of the tube by connecting the upper end ot a suction pump. Can mercury be puled up into the pump by this process?

A glass tube of 1.0 m length is filled with water . The water can be drained out slowly at the bottom of the tube . If a vibrating tuning fork of frequency 500 Hz is brought at the upper end of the tube and the velocity of sound is 300 m//s , then the total number of resonances obtained will be

A glass tube of 1.0 m length is filled with water . The water can be drained out slowly at the bottom of the tube . If a vibrating tuning fork of frequency 500 c//s is brought at the upper end of the tube and the velocity of sound is 330 m//s , then the total number of resonances obtained will be