Ray Optics & Optical Instruments  MCQs

MCQs of Ray Optics & Optical Instruments

Showing 71 to 80 out of 143 Questions
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71.
One cannot see through the fog, because _____ .
(a) fog absorbs light
(b) refractive index of fog is infinity
(c) light is scattered by the droplets in the fog
(d) light suffers total reflection
Answer:

Option (c)

72.
The clouds generally appear white due to _____ .
(a) reflection of light
(b) scattering of light
(c) diffraction of light
(d) dispersion of light
Answer:

Option (b)

73.
When the length of microscope tube increases, its magnifying power _____ .
(a) decreases
(b) increases
(c) does not change
(d) None of these
Answer:

Option (b)

74.
The focal lengths of objective and the eye-piece of a compound microscope are f0 and fe respectively, then _____ .
(a) f0 = fe
(b) f0 < fe
(c) f0 > fe
(d) None of the above
Answer:

Option (b)

75.
In which of the following mirror, man will not see image greater than himself ?
(a) Concave mirror
(b) Convex mirror
(c) Plane mirror
(d) Both (B) and (C)
Answer:

Option (d)

76.
Dispersive power of prism depends on the _____ .
(a) material of the prism
(b) shape of the prism
(c) size of the prism
(d) None of these
Answer:

Option (a)

77.
A glass slab (μ = 1.5) of thickness 6 cm is placed over a written paper. What will be the shift in the letters ?
(a) 4 cm
(b) 2.0 cm
(c) 1 cm
(d) None of these
Answer:

Option (b)

78.
The limit of resolution of an optical instrument arises on account of _____ .
(a) polarization
(b) reflection
(c) refraction
(d) diffraction
Answer:

Option (d)

79.
A concave mirror of focal length 15 cm forms a virtual image having twice the linear dimensions of the object. The position of the object will be _____ cm.
(a) 15
(b) 30
(c) 45
(d) -7.5
Answer:

Option (d)

80.
A mark at the bottom of a liquid beaker appears to rise by 0.1 m. If the depth of the liquid is 1.0 m, then refractive index of the liquid is _____ .
(a) 1.1
(b) 1.3
(c) 1.5
(d) 1.7
Answer:

Option (a)

Showing 71 to 80 out of 143 Questions
5 6 7 8 9 10