WorksheetsGrade 10 - Science - 2 - Optics
Total questions: 21
Worksheet time: 14mins
The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
a) A
b) B
c) C
d) D
Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens
a) f
b) 2f
c) infinity
d) between f and 2f
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce
a) a convergent beam of light
b) a divergent beam of light
c) a parallel beam of light
d) a coloured beam of light
A convex lens forms a real, diminished point sized image at focus. Then the position of the object is at
a) focus
b) infinity
c) at 2f
d) between f and 2f
In a myopic eye, the image of the object is formed
a) behind the retina
b) on the retina
c) in front of the retina
d) on the blind spot
The eye defect ‘presbyopia’ can be corrected by
a) convex lens
b) concave lens
c) convex mirror
d) Bi focal lenses
Which of the following lens would you prefer to use while reading small letters found in a dictionary?
a) A convex lens of focal length 5 cm
b) A concave lens of focal length 5 cm
c) A convex lens of focal length 10 cm
d) A concave lens of focal length 10 cm
If VB, VG, VR be the velocity of blue, green and red light respectively in a glass prism, then which of the following statement gives the correct relation?
a) VB = VG = VR
b) VB > VG >VR
c) VB < VG < VR
d) VB < VG > VR
The path of the light is called as (a)
The refractive index of a transparent medium is always greater than (a)
Amount of light entering into the eye is controlled by (a)
Velocity of light is greater in denser medium than in rarer medium
(a)
Increase in the converging power of eye lens cause ‘hypermetropia’
(a)
The convex lens always gives small virtual image.
(a)
Retina
a) Path way of light
b) Far point comes closer
c) near point moves away
d) Screen of the eye
f) Power of accommodation
Pupil
a) Path way of light
b) Far point comes closer
c) near point moves away
d) Screen of the eye
f) Power of accommodation
Ciliary muscles
a) Path way of light
b) Far point comes closer
c) near point moves away
d) Screen of the eye
f) Power of accommodation
Myopia
a) Path way of light
b) Far point comes closer
c) near point moves away
d) Screen of the eye
f) Power of accommodation
Hypermetropia
a) Path way of light
b) Far point comes closer
c) near point moves away
d) Screen of the eye
f) Power of accommodation
Assertion: If the refractive index of the medium is high (denser medium) the velocity of the light in that medium will be small
Reason: Refractive index of the medium is inversely proportional to the velocity of the light
a) If both assertion and reason are true and reason is the correct explanation of assertion.
b) If both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false.
d) Assertion is false but reason is true.
Assertion: Myopia is due to the increase in the converging power of eye lens.
Reason: Myopia can be corrected with the help of concave lens
a) If both assertion and reason are true and reason is the correct explanation of assertion.
b) If both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false.
d) Assertion is false but reason is true.
