A beam of light is converging towards a point on a screen.A plane parallel plate of glass is introduced in the path of this converging beam.How will the point of convergence be shited ?Draw the ray diagram.

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is: a convex lens of focal length 20cm?

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does thebeam converge if the lens is: a concave lens of focal length 16cm?

Explain how a parallel beam of light on refraction from a convex lens gets converged.

Explain how a parallel beam of light on reflection from a concave mirror gets converged.

A convergent beam of light passes through a diverging lens of focal length 0.2 m and comes to focus at distance 0.3 m behind the lens.Find the position of the point at which the beam would converge in the absence of the lens.

A narrow beam of light is incident normally on one face of a glass prism having refractive index 1.48 . Find the angle of prism if the ray makes a grazing emergence along the other face. Draw a diagram showing the path of rays.

A beam of light strikes a glass sphere of 20 cm diameter converging towards a point 40 cm behind the pole of the spherical surface.Fnd the position of the image,if the refractive index of glass is 1.5.

Two beams of light having intensities I and 4 I interfere to produce a fringe pattern on a screen.The phase difference between the beams is pi//2 at point A and pi at point B.Then the differnece between the resultant intensities at A and B is