Q.13 An oil film floating on water surface exhibits colour pattern due to the phenomenon of:
A) Diffraction C)Interference
B) Polarization D) Surface tension
Q.14 The value of the least distance of distinct vision or near point is ______ for a normal human eye.
A) 20 cm C) 10 cm
B) 25 cm D) 15 cm
Q.15 In a compound microscope, the magnification by objective = 20, magnification by eyepiece = 11, then the total magnification is
A) M = -220 C) M = -0.05
B) M = -0.19 D) M = 220
Q.16 The distance between atoms is 0.30 nm. What will be the wavelength of Xrays at angle θ = 30o for 1st order diffraction?
A) λ = 0.60 nm C) λ = 0.20 nm
B) λ = 0.30 nm D) λ = 0.90 nm
A) Diffraction C)Interference
B) Polarization D) Surface tension
Q.14 The value of the least distance of distinct vision or near point is ______ for a normal human eye.
A) 20 cm C) 10 cm
B) 25 cm D) 15 cm
Q.15 In a compound microscope, the magnification by objective = 20, magnification by eyepiece = 11, then the total magnification is
A) M = -220 C) M = -0.05
B) M = -0.19 D) M = 220
Q.16 The distance between atoms is 0.30 nm. What will be the wavelength of Xrays at angle θ = 30o for 1st order diffraction?
A) λ = 0.60 nm C) λ = 0.20 nm
B) λ = 0.30 nm D) λ = 0.90 nm
Q.17 The value of least distance vision for normal eye is
A) 20 cm C) 25 cm
B) 30 cm D) 40 cm
A) 20 cm C) 25 cm
B) 30 cm D) 40 cm