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
Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens
b) 2f
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce
c) a parallel beam of light
Magnification of a convex lens is
c) either positive or negative
A convex lens forms a real, diminished point sized image at focus. Then the position of the object is at
b) infinity
Power of a lens is -4D, then its focal length is
c) -0.25 m
In a myopic eye, the image of the object is formed
c) in front of the retina
The eye defect presbyopia can be corrected by
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
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
Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens
b) 2f
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce
c) a parallel beam of light
Magnification of a convex lens is
c) either positive or negative
A convex lens forms a real, diminished point sized image at focus. Then the position of the object is at
b) infinity
Power of a lens is -4D, then its focal length is
c) -0.25 m
In a myopic eye, the image of the object is formed
c) in front of the retina
The eye defect presbyopia can be corrected by
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
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?
c) VB < VG < VR
The path of the light is called as_________
Ray
The refractive index of a transparent medium is always greater than__________
One
If the energy of incident beam and the scattered beam are same, then the scattering of light is called as _________scattering.
Elastic
According to Rayleighs scattering law, the amount of scattering of light is inversely proportional to the fourth power of its_________
Wavelength
Amount of light entering into the eye is controlled by___________
Iris
Retina
Screen of the eye
Pupil
Path way of light
Ciliary muscles
Power of accommodation
Myopia
Far point comes
closer
Hypermetropia
near point moves
away
Velocity of light is greater in denser medium
than in rarer medium
FALSE (Velocity of light is lesser in denser medium than in rarer medium.)
The power of lens depends on the focal
length of the lens
TRUE
Increase in the converging power of eye
lens cause hypermetropia
TRUE
The convex lens always gives small virtual
image.
FALSE (Concave lens always gives small virtual image.)
(A): If the refractive index of the medium is high (denser medium) the velocity of the light in that medium will be small. (R): Refractive index of the medium is inversely proportional to the velocity of the light
(a) Both the assertion and the reason
are true and the reason is the correct
explanation of assertion.
(A): Myopia is due to the increase in the converging power of eye lens.. (R): Myopia can be corrected with the help of concave lens.
(b) Both the assertion and the reason are
true, but the reason is not the correct explanation of the assertion.
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
Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens
b) 2f
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce
c) a parallel beam of light
Magnification of a convex lens is
c) either positive or negative
A convex lens forms a real, diminished point sized image at focus. Then the position of the object is at
b) infinity
Power of a lens is -4D, then its focal length is
c) -0.25 m
In a myopic eye, the image of the object is formed
c) in front of the retina
The eye defect presbyopia can be corrected by
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
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?
c) VB < VG < VR
The path of the light is called as_________
Ray
The refractive index of a transparent medium is always greater than__________
One
If the energy of incident beam and the scattered beam are same, then the scattering of light is called as _________scattering.
Elastic
According to Rayleighs scattering law, the amount of scattering of light is inversely proportional to the fourth power of its_________
Wavelength
Amount of light entering into the eye is controlled by___________
Iris
Retina
Screen of the eye
Pupil
Path way of light
Ciliary muscles
Power of accommodation
Myopia
Far point comes
closer
Hypermetropia
near point moves
away
Velocity of light is greater in denser medium
than in rarer medium
FALSE (Velocity of light is lesser in denser medium than in rarer medium.)
The power of lens depends on the focal
length of the lens
TRUE
Increase in the converging power of eye
lens cause hypermetropia
TRUE
The convex lens always gives small virtual
image.
FALSE (Concave lens always gives small virtual image.)
(A): If the refractive index of the medium is high (denser medium) the velocity of the light in that medium will be small. (R): Refractive index of the medium is inversely proportional to the velocity of the light
(a) Both the assertion and the reason
are true and the reason is the correct
explanation of assertion.
(A): Myopia is due to the increase in the converging power of eye lens.. (R): Myopia can be corrected with the help of concave lens.
(b) Both the assertion and the reason are
true, but the reason is not the correct explanation of the assertion.