WorksheetsHuman eye
Total questions: 20
Worksheet time: 10mins
The muscular diaphragm that controls the size of the pupil is ---------------
cornea
ciliary muscles
Iris
retina
Having two eyes facilitates in
A : Increasing the field of view
B : Bringing three-dimensional view
C : Developing the concept of distance/ size Then the correct option is/are
A only
A and B only
B only
A, B and C
The black opening between the aqueous humour and the lens is called --------------
retina
iris
cornea
pupil
Near and far points of a young person normal eye respectively are---------
0 and infinity
0 and 25 cm
25 cm and infinity
25 cm and 150 cm.
The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called --------------
Long-sightedness
Far-sightedness
Hypermetropia
All above
The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called -------------
Power of observation of the eye
Power of adjustment of the eye
Power of accommodation of the eye
Power of enabling of the eye
The image formed on the retina of the human eye is ----------------
virtual and inverted
real and inverted
real and erect
virtual and erect
When white light enters a prism, it gets split into its constituent colours. This is due to _____________________
different refractive index for different wavelength of each colour
each colours has same velocity in the prism.
prism material have high density.
Scattering of light
The air layer of atmosphere whose temperature is less then the hot layer behave as optically
denser medium
rarer medium
inactive medium
either denser or rarer medium
Refraction of light by the earth’s atmosphere due to variation in air density is called -------------
atmospheric reflection
atmospheric dispersion
atmospheric scattering
atmospheric refraction
One cannot see through the fog, because---------------
refractive index of the fog is very high
light suffers total reflection at droplets
fog absorbs light
light is scattered by the droplets
Twinkling of stars is due to atmospheric ---------------------------
dispersion of light by water droplets
refraction of light by different layers of varying refractive indices
scattering of light by dust particles
internal reflection of light by clouds.
The focal length of the eye lens increases when eye muscles---------------
are relaxed and lens becomes thinner
contract and lens becomes thicker
are relaxed and lens becomes thicker
contract and lens becomes thinner
Assertion: Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason: There are no rods or cones present at the junction of optic nerve and retina in the eye.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
Assertion is true but the Reason is false
The statement of the Assertion is false but the Reason is true.
Assertion: The near-point of a hypermetropic eye is more than 25 cm away.
Reason: Hypermetropia is corrected using spectacles containing concave lenses.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
Assertion is true but the Reason is false
The statement of the Assertion is false but the Reason is true.
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
+0.5D
-0.5D
+0.2D
-0.2D
When white light enters a glass prism from air, the angle of deviation is least for ---------
Blue light
yellow light
violet light
red light
Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.
Isaac Newton
Einstein
Kepler
Hans Christian Oersted
What is the other name of old hypermetropia?
myopia
contradict
hypermetropia
none of these
Colored part in the human eye is called ------
Iris
Pupil
both a and b
none of these
