Optics Answers

what is the difference between a real and virtual image?

Starting from Maxwell’s field equations in free space, derive wave equation

Show that all Fresnel half-period zones have the same area.

Show that plane polarized light and circularly polarized light are special cases of
elliptically polarized light.

A layer of benzene (u =1.5) 12 cm thick floats on water layer (u =4/3) 8 cm thick in a vessel. When viewed from the top, the apparent depth of bottom of vessel below the surface of benzene will be
(1) 20 cm
(2) 14 cm
(3) 7 cm
(4) 21 cm

A travelling microscope is focused on to a scratch on the bottom of a beaker. Water of refractive index 4/3 is poured in it. Then the microscope is to be lifted through 2 cm focus it again. Find the depth of water in the beaker.
(1) 4 cm
(2) 8 cm
(3) 8/7 cm
(4) 8/3 cm

While a moving picture is being screened, a boy introduced a glass slab of thickness 3 cm and refractive index 1.5 between the projector and the screen. In order to have a clear picture on the screen, the screen should be moved through a distance of
(1) 1 cm away
(2) 1 cm nearer
(3) 2 cm away
(4) 3 cm away

A light ray of angle of incidence 40 degree emerged from the prism in minimum deviation position. Then what is the angle of incidence on the second surface?
(1) 90 degree
(2) 0 degree
(3) 40 degree
(4) 0 degree

For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index
(1) Lies between 2^1/2 and 1
(2) Lies between 2 and 2^1/2
(3) Is less than 1
(4) Is greater than 2

A parallel beam of monochromatic light falls on a combination of a convex lens and a concave lens of focal lengths 15 cm and 5 cm respectively.What is the distance between the two lenses to obtain a parallel beam of light from the concave lens?
options are :
a) 20 cm b) 3 cm c) 10 cm d) 45 cm