ABO OPTICAL EXAM| QUESTIONS WITH COMPLETE SOLUTIONS
Light falling on the front surface of a spectacle lens is:
A) partially reflected, partially absorbed and the remainder refracted
B) partially reflected and the remainder refracted
C) partially absorbed and the remainder refracted
D) totally refracted Correct Answer: A) partially reflected, partially absorbed and the remainder
refracted
Concave mirror:
A) can focus parallel incident rays to form a real image
B) can focus parallel incident Rays to form a virtual image
C) always produce inverted images of real objects
D) produces virtual images smaller than the real object. Correct Answer: A) can focus parallel
incident rays to form a real image
Reflection is reduced by depositing a layer of magnesium fluoride on the lens surface. It has a
thickness of:
A) 1/2 the wave length of white light
B) 1/4 the wave length of white light
C) 1/2 the wave length of blue-violet light
D) the wave length of yellow light Correct Answer: D) the wave length of yellow light
White light is broken into its components colors when it is:
A) diffracted
B) refracted
C) reflected
D) diffracted or refracted Correct Answer: D) diffracted or refracted
Anti reflective coating of a lens is based on the principle of:
A) diffraction
B) reflection
C) interference
D) reflection and interference Correct Answer: D) reflection and interference
To the viewer the image seen in a plane mirror appears to be:
A) inverted
B) 1/2 as large as the object
C) twice as large as the object
D) as far behind the mirror as the object is in front of it. Correct Answer: D) as far behind the
mirror as the object is in front of it.
The velocity of light is least in:
A) air
B) polycarbonate
C) water
Light falling on the front surface of a spectacle lens is:
A) partially reflected, partially absorbed and the remainder refracted
B) partially reflected and the remainder refracted
C) partially absorbed and the remainder refracted
D) totally refracted Correct Answer: A) partially reflected, partially absorbed and the remainder
refracted
Concave mirror:
A) can focus parallel incident rays to form a real image
B) can focus parallel incident Rays to form a virtual image
C) always produce inverted images of real objects
D) produces virtual images smaller than the real object. Correct Answer: A) can focus parallel
incident rays to form a real image
Reflection is reduced by depositing a layer of magnesium fluoride on the lens surface. It has a
thickness of:
A) 1/2 the wave length of white light
B) 1/4 the wave length of white light
C) 1/2 the wave length of blue-violet light
D) the wave length of yellow light Correct Answer: D) the wave length of yellow light
White light is broken into its components colors when it is:
A) diffracted
B) refracted
C) reflected
D) diffracted or refracted Correct Answer: D) diffracted or refracted
Anti reflective coating of a lens is based on the principle of:
A) diffraction
B) reflection
C) interference
D) reflection and interference Correct Answer: D) reflection and interference
To the viewer the image seen in a plane mirror appears to be:
A) inverted
B) 1/2 as large as the object
C) twice as large as the object
D) as far behind the mirror as the object is in front of it. Correct Answer: D) as far behind the
mirror as the object is in front of it.
The velocity of light is least in:
A) air
B) polycarbonate
C) water
