The light waves represented by three rays shown in the diagr

The light waves represented by three rays shown in the diagram all have the same Rank the fit the b) 1, 2, layers according to the speeds the waves, to 5.3 fit 4 3 of layer c) 2, greatest. into layer 3. 3, 1.2 d) 3, ayer 1 e) 1,3,2 In a Young\'s double experiment, layer 3 e-slit a) the slit is doubled This results in: b) an increase separation a decrease in fringe c) a halving in fringe intensity of the wavelength d) a halving of the fringe spacing e) a doubling of the fringe spacing A glass (n 1.6) lens is coated with a thin film (n 1.3) to reduce reflection of certain incident light. If is the wavelength of the light in the film, the least film thickness is a) less than N4 boN4 c) N2 e) more than If the electric field in a plane electromagnetic wave is given by E Eosin[(3 x 106 m x) ot], the value of ois: a) 0.01 rad/s b) 10 rad s c) 100 rad s d) 9 x 1014 rad/s e) 9 x 1016 rad s The diagrams show four pairs of polarizing sheets, with the polarizing directions indicated by dashed sheets each pair ptaced one behind the otherand unpolarized light. The incident intensity is the same for all pairs of sheets. Rank the pairs according to the intensity of transmitted light, least to greatest. a) 1, 2, 3, 4 b) 4, 2, 1, 3 c) 2, 4, 3, 1 d) 2, 4, 1,3 e) 3, 1, 4, 2

Solution

Frequency if same in all layers are same.

Velocity = frequency x wavelength

i.e., velocity is directly proportional to wavelength.

In first layer ,4.7 wavelengths fitted.So, wavelength in layer 1 is = layer width / 4.7

In second layer ,3.2 wavelengths fitted.So, wavelength in layer 2 is = layer width / 3.2

In third layer ,5.3 wavelengths fitted.So, wavelength in layer 3 is = layer width / 5.3

So, answer is 2,1,3

(2).Fringe width is inversely proportional to slit width.

If slit separation is doubled then halving of the fringe spacing.