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A light ray falls on the boundary surface between two media, if the angle of incidence is  $60^0$  and the angle of refraction is $30^0$   , the relative refractive index from the first medium to the second medium equals ………….

• 2
  
  

•  $\sqrt{3}$  
  

•  $\sqrt{2}$  

•  $\frac{1}{2}$  

A red light ray falls from air on the surface of glass. if the wavelength of red light in space is 7000  $A^o$  and the refractive index of glass is 1.5, the wavelength of red light in glass is ………………

• 10500   $A^o$   

• 8564 $A^o$  

• 5543 $A^o$  

• 4667 $A^o$  

When a light ray falls at an angle from a medium of refractive index 1.2 on a surface of another medium of refractive index 1.5

• its speed increases and it refracts toward the normal line

• its speed decreases and it refracts toward the normal line

• its speed decreases and it refracts away from the normal line

• its speed increase and it refracts away from the normal line

A light ray falls from air on the surface of a glass slab at an angle of 52^o. if the ray is deviated by an angle 19^o, the refractive index of glass is …………….

• 0.83

• 1.33

• 1.45

• 1.65

If the distance between the first maxima and the central fringe in Young's double-slit experiment is 2 mm, so the distance between the third minima and the central fringe equals ..........

• 2 mm

• 5 mm

• 6 mm

• 7 mm

In Young's double-slit experiment, if the distance between two coherent sources was 1.6 mm where the fringes were formed on a screen at distance 60 cm the two sources and the third bright fringe was at 0.6 mm from the central fringe, find the wavelength of the used light.

• $2\times10^{-4}$

• $75\times10^{-3}$

• $0.75$

• $0.02$

Light waves fall on different apertures of different sizes, so the diffraction of light will be most observable if the aperture size is...............

• 1 m

• 10^-2 m

• 10^-3 m

• 10^-5 m

In Young's double-slit experiment, if R= $10^4$ d, then ………………

•  $\Delta\ y\ =\lambda$  

•  $\Delta\ y\ =10^4\ \lambda$  

•  $\Delta\ y\ =10^{-4}\ \lambda$  

•  $\Delta\ y\ =\frac{\lambda}{10}$